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Biographical Memoirs, Volume 86

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Biographical Memoirs, Volume 86 WILLIS H. FLYGARE July 24, 1936–May 18, 1981 BY DAVID CHANDLER MAY 18, 1981, WAS a rainy morning in Urbana, Illinois. My phone rang. It was Peter Beak. “Bill died,” he said. “Bill” was Willis H. Flygare. He was a close friend to Peter Beak, a mentor to me, husband of Ruth, and father of Karna, John, Amy, and Sarah. He was 44 years old. He was a great physical chemist. He died of amyotrophic lateral sclerosis (ALS; in America often called Lou Gehrig’s disease). During the next two years the American Chemical Society held a memorial symposium honoring Bill Flygare, and both the Journal of Chemical Physics (vol. 78, no. 6) and the Journal of Physical Chemistry (vol. 87, no. 12), the primary physical chemistry publications of that time, produced large memorial issues honoring him. The issue of the Journal of Chemical Physics alone contained 117 original research articles written by scientists throughout the world, filling 965 journal pages covering every imaginable facet of research in physical chemistry. It was the largest single issue of its kind, an unprecedented outpouring of respect and gratitude reflecting the significance of Bill’s life. He was a remarkably productive and influential scientist. He was charismatic. He had an enthusiasm for life and a sense of humor that were difficult to match. Above all, as I try to describe in the following pages, he was brave.

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Biographical Memoirs, Volume 86 EARLY YEARS Bill Flygare was born on July 24, 1936, to Willis B. and Doris H. Flygare in Jackson, Minnesota. Jackson is a county seat in southern Minnesota, about 8 miles from Sherburn, where Bill Flygare grew up and went to high school. Sherburn is a small farming town, with a population of little more than 1,000. Bill’s parents were of Scandinavian descent like many residents of this area. Strong family ties, with frequent and large gatherings of relatives and friends, marked his childhood. Discussions focused on the dramatic seasonal variations of the area and their effect on the regional agro economy and on the politics of the day, which was dominated by World War II and its aftermath. Bill was the older brother to Tom (eight years younger) and Nancy (nine years younger). Their father owned a clothing store. In contrast to Bill’s usual ways of dressing in later years, the store concentrated on relatively formal men’s attire and had the motto “Bill Flygare Suits Me.” In addition to their house in town, the family had a summer cottage adjacent to a lake and a golf course outside of Sherburn. Bill spent many summer hours boating, fishing, and golfing. His teenage years coincided with the expanded opportunities of the relatively optimistic postwar period in the United States. Bill was a good student, particularly interested in mathematics, physics, and chemistry. He was introduced to the building and construction trade during the summer months. He began by working as a carpenter’s apprentice, and by the time he graduated from high school, he had his own construction crew building houses in his community. Years later in Urbana, Illinois, Bill would build and remodel parts of his house, as well as rental properties in which he invested. Bill was a fine athlete, a natural leader, and competitive. Ruth Swansson first noticed Bill Flygare as an athlete. She

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Biographical Memoirs, Volume 86 was a cheerleader for the neighboring Trimont High School. Bill led the Sherburn High School teams in football, basketball, and baseball against Trimont. He was gifted and handsome; she was very impressed. In later years, whether it was in pickup basketball games with Illinois students and faculty where he outclassed most, coaching his son’s Little League team to win the Champaign-Urbana twin city championship, or smacking wild serves and forehands on a tennis court, he continued to play with the greatest possible enjoyment and wholesome competitive zeal. Describing Bill’s approach to skiing down a mountain, Peter Beak would say, “It was best to arrive at the bottom in one piece, but it was not as important as being first.” HIGHER EDUCATION Bill graduated from high school in June 1954. The subsequent fall he entered St. Olaf College in Northfield, Minnesota. He would later say of his first year in college that his chemistry, physics, and calculus courses were boring, but that he learned to read and write to his satisfaction. He was unusually facile in these skills, as I would often think when I worked with him in Illinois. By his third year of college his science and mathematics courses became interesting, and he began dating Ruth Swansson. Ruth had graduated from Trimont High School the previous spring, and she entered Gustavus Adolphus College that fall. St. Olaf and Gustavus colleges are within driving distance from one another, but Bill did not have access to an automobile. He would regularly hitchhike between the two schools to visit Ruth. The St. Olaf College faculty was overwhelmed with Bill Flygare’s enthusiasm for learning. One of his teachers, Al Finholt, would later describe Bill’s insistence that chemistry majors needed to learn large amounts of mathematics, physics,

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Biographical Memoirs, Volume 86 and humanities. The faculty believed there was no realistic way to pack all that Bill wanted to learn into four years of courses. Bill nevertheless did absorb all this material, reading and learning by himself outside the regular program of courses. Indeed, self-reliance and confidence were invariants of Bill Flygare’s personality, whether teaching himself science or fixing automobiles (his family car in Urbana was always an old one for that reason). The knowledge and ways of thinking about nature that Bill acquired in his independent way were often unorthodox and underestimated by others. One of Bill’s former students, Ben Ware, remarked that he initially confused Bill’s unorthodox thinking for lack of extraordinary intelligence or insight. “Only after years of tolerating his special type of diversionary thinking,” Ben wrote, “did I realize that that was actually [Flygare’s] distinguishing genius.” At the start of Bill’s fourth year of college in October 1957, the Soviet Union launched Sputnik I. This event was both exciting and frightening. The United States had yet to achieve such success. Many young Americans perceived a threat to their country, and it motivated them to pursue scientific careers. Bill was among those, and he applied to graduate school. Also during that fourth year, Bill obtained an automobile, and Ruth moved even closer to St. Olaf, to Minneapolis, where she was taking courses in nursing. Bill graduated from St. Olaf in June 1958 with majors in chemistry, physics, and mathematics. Later that summer he and Ruth were married. They traveled west together, where Bill entered graduate school in chemistry at the University of California, Berkeley. There he blossomed. Bill took his Ph.D. in microwave spectroscopy under the direction of William D. Gwinn. He chose this area of research because it combined sophisticated experimental techniques with a strong theoretical component of molecular quantum mechanics.

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Biographical Memoirs, Volume 86 Bill enjoyed both experiment and theory. He was brilliant with the former and fearless in his approach to both. One hurdle for all Berkeley chemistry graduate students is an oral qualifying examination instituted long ago by Berkeley’s founding chemist G. N. Lewis. In this examination students are required to explain and justify their research projects to a committee of faculty. The student’s research advisor is not part of this committee. Through aggressive questioning the committee tries to determine the boundaries of the student’s useful knowledge of physics and chemistry, and thereby decide whether the student is qualified to continue working toward a Ph.D. The examination takes place during the student’s second year of graduate study. While many able students require two attempts before passing this daunting examination, Bill required only one, and he did more than just pass. The committee found it impossible to learn the extent of Bill’s knowledge. There was simply nothing they could think of asking that he could not answer. The eminent Berkeley physical chemist Hal Johnston recalls Bill’s performance to this day. No performance of any student he examined before or since matched it. “It was a joy,” Hal says. William Gwinn later wrote that Bill was additionally exceptional in his ability to work with others on a very high level and that he was particularly good in discussions of newly developing ideas. Such discussions were always friendly but far from detached or dispassionate. Indeed, Bill’s participation in constructive scientific debate remained an integral part of the way he worked throughout his career. He would often change views and bias during a discussion. Original ideas would be greatly developed and expanded. Bill spent long hours in the laboratory at Berkeley, “working like crazy,” Ruth would say. But he would also take breaks to enjoy the city of San Francisco and the California countryside, hiking and skiing. These were wonderful times

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Biographical Memoirs, Volume 86 for Bill and Ruth. They often thought they would like to eventually settle in the San Francisco Bay area. Their apartment was in a comfortable old building on Francisco Street. Today the building no longer exists. It was removed to build what is now the North Berkeley station for the commuter train line known as BART. In the mornings they would often walk together up the hill to campus, where Ruth would then take a bus to her nursing job at the Oakland Children’s Hospital. Ruth would sometimes audit courses at the university, including Edward Teller’s lectures on physics for laymen. Bill progressed quickly in his research, and by the start of his third year in graduate school, William Gwinn had written to Herbert Gutowsky at the University of Illinois, recommending Bill for a faculty position: “Flygare is a very pleasant person with whom to work. He is married and has a wife who will be a great asset to him. I believe he has very good prospects for a future in academic life and I recommend him to you with enthusiasm.” In January 1961 Bill interviewed at Illinois. The faculty was impressed and offered him a job during the visit. Ruth had accompanied Bill on the trip. The last day of their visit they were scheduled to depart by airplane. It was the bitter aftermath of a snowstorm, and the Ozark Airline DC-3 planes that serviced Urbana-Champaign were grounded. Herb Gutowsky drove them to the Illinois Central train station to catch a late afternoon train to Chicago. As Herb unloaded them and their luggage in the subzero (Fahrenheit!) weather, Herb and Bill discussed intensely the resources needed and the opportunities available in Urbana for his development as a scientist. Ruth could see that Bill was very happy and excited, but the wind-chill factor concerned her. Bill accepted the offer from Illinois, to begin working as a chemistry instructor in September 1961. Ruth was pregnant

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Biographical Memoirs, Volume 86 with their first child. Karna was due in August but kept everyone waiting until September 13. Two days later Bill packed up their car and the attached U-Haul trailer and drove east with their pet cat on his shoulder. He made the drive from Berkeley to Urbana in less than three days, arriving just in time to teach his first class. Two weeks later Ruth and Karna arrived in Urbana. Bill met them at the airport and drove them to their first house on Bliss Drive, a University of Illinois rental property for new faculty. Another new chemistry instructor and his wife, Peter and Sandy Beak, had recently moved into a similar house two doors down. The Flygare’s cat liked to sit on the Beaks’ automobile. That is how the Beaks and Flygares got to know each other. It was a deep and lasting friendship, bringing Peter Beak to write many years after Bill’s death, “I still miss him.” ILLINOIS, EARLY YEARS Bill Flygare would spend the next two decades, his entire career, at the University of Illinois. It was an extraordinary time at Illinois. Harry Drickamer, Herb Gutowsky, Jiri Jonas, Rudy Marcus, and others were among its stellar faculty. During that period, it was arguably the best physical chemistry program in the world. While Marcus is the only one to have actually won a Nobel Prize (for his theory of electron transfer reactions), Gutowsky (who developed the first ways to fingerprint molecules with nuclear magnetic resonance) and Drickamer (who pioneered high-pressure chemical physics) were equally deserving. Bill quickly showed he was rightfully part of this heady group. Within five years of his arrival at Illinois, he was a full professor, and within six, MIT and the University of Chicago had courted him. Turning them down, he wrote, “The primary consideration is that I have a very large personal investment in the future at Illinois.” Within 13 years

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Biographical Memoirs, Volume 86 of his arrival, in 1974, he was elected to the National Academy of Sciences. More than 30 graduate students would eventually receive their Ph.D.s under his direction. He wrote the advanced physical chemistry textbook Molecular Structure and Dynamics, and he coauthored more than 200 research papers, the last 25 were written during the last two years of his life while resisting the effects of a ravaging illness, about which I have more to say later. As the numbers indicate, his students worked very hard. Bill demanded as much. He wrote, “New students are expected to … do new and interesting experiments. The experience gained in designing and constructing complex metal, glass, optical, electronic, high vacuum, and high pressure apparatus is vital to the student’s future as a viable scientist…. A close union of theory and experiment is [to be] attempted.” Many students responded positively. One of those, Ben Ware, later explained: “I knew that science was supposed to be exciting and here was a man who carried that excitement with him and conveyed it to all who would listen. For me, and for many others of his students, he was a scientific pied piper whom we would have followed anywhere.” Another, John Pochan, recalls Bill’s love of athletic competition, and adds that Bill “enjoyed the scientific competition just as much.” On one occasion, Pochan remembers, Bill and his students learned of another group closing in on a research problem that they too were trying to solve. Bill worked with his students for three days straight, day and night, finishing the project ahead of the competing group. “He expected a lot and he gave a lot,” Pochan says. For some students, however, and for some colleagues as well, Bill was hard to take. As with all people, his strength could also be a weakness. He was often impatient with those who could not keep up with his train of thought, and he

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Biographical Memoirs, Volume 86 was intolerant of those he felt did not work hard enough. Since his thoughts were quick, often unorthodox, and sometimes not quite right, his impatience could be inappropriate. While many found it stimulating to talk science with him—which invariably meant formulating new ideas, arguing, reformulating or refining, arguing again, and so forth—others found the exercise overwhelming. A few would go away insulted. A famous physical chemist once wrote asking a question concerning one of Bill’s long and detailed papers on the molecular Zeeman effect. Bill felt that the answer to the question was clearly spelled out in the paper and that the scientist was lazy and possibly insulting not seeing as much. He wrote back answering the question and adding gratuitously “with friends like you, who needs enemies.” By the fall of 1966 the Flygare research group had eight graduate students and four postdoctoral assistants. It would remain close to this size for the next 15 years. Experiments were being done on high-resolution microwave spectroscopy, microwave-microwave double resonance and rotational relaxation, and matrix isolation infrared spectroscopy. They were able to routinely measure the small splittings of rotational transitions caused by spin-rotation interactions, and in this way they studied many systems of chemical interest. Before then others had been able to observe these splittings only in a few special cases. The Flygare group’s observations were particularly influential because Bill’s theoretical work established their relationship to molecular electronic structure and the nuclear magnetic shielding of a molecule. Leading this large group of research students in such a varied range of projects required special skill, all the more remarkable as Bill had just turned 30 the previous summer. Rick Shoemaker, who joined the group during that time, recalls that Bill would usually suggest possible research projects, but then encourage the students to work on their

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Biographical Memoirs, Volume 86 own. He would regularly look to see that his students were making good progress, usually every day, and take an active role when students were struggling. He had the more advanced students instruct the newer students on how to operate and maintain equipment, and he encouraged capable students to pursue well-designed projects of their own making. “He came across more as a wise older brother than a research director or manager,” Rick says. At the 1967 American Chemical Society meeting Bill reported the measurement of a molecular magnetic susceptibility anisotropy by microwave spectroscopy. These results on formaldehyde, published in 1968, were made possible by Bill’s exploitation of the molecular Zeeman effect. In a previous theoretical paper he had analyzed the principles of the molecular Zeeman effect and established that molecular quadrupole moments could be measured directly by using both the linear and quadratic field Zeeman effect. With this and related connections his group’s subsequent measurements of the molecular Zeeman effect determined molecular g-values, magnetic susceptibility tensor elements, molecular quadrupole moments, second moments of electronic charge distributions, and in some cases the signs of the electric dipole moments for about 90 molecules. In 1969 alone Bill and his students published more than 20 papers exploiting the molecular Zeeman effect. This body of work attracted wide attention, and it catapulted Bill into the National Academy of Sciences. The results of these experiments seemed important at the time. It was believed that knowledge of molecular dipole and quadrupole moments would significantly contribute to a good understanding of intermolecular forces. In current times, however, it is understood that intermolecular forces and their manifestations, especially in condensed phases, are more complicated than those numbers reveal. Further, experiment

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Biographical Memoirs, Volume 86 topic of intermolecular correlations in liquids is unequivocal about his agreement with my theoretical work. During this period, in the mid-1970s, Bill turned his attention back to high-resolution microwave spectroscopy, now in the time domain. He was devising techniques that resembled the free induction decay and pulse methods exploited with nuclear magnetic resonance spectroscopy. He was thinking and working with concepts like quantum coherence and dephasing in his characteristically unconventional ways. A young physical chemist interviewing for a faculty position in Urbana at that time talked to Bill about these things. Bill was unimpressed with the candidate’s understanding. The candidate did not get a job offer from the University of Illinois, but he did get one from the California Institute of Technology. Some 20 years later this Caltech chemist was awarded a Nobel Prize for work done with time-resolved spectroscopy. ILLINOIS, FINAL YEARS By the summer of 1977 Bill’s efforts with time-domain microwave spectroscopy seemed to be nearing fruition. His student Bill Hoke had nearly finished the work that he would submit the next spring as his Ph.D. thesis, “Transient Rotational Relaxation Studies and Fourier Transform Microwave Spectroscopy.” The techniques described there were important elements in a new and powerful spectroscopy that Bill and his students Terry Balle, Ed Campbell, and Mike Keenan would invent during the next 18 months. Also by that summer the first signs of disease appeared that would make this invention Bill’s last contribution to science. Weakness in his right hand plus annoying sensations in his right wrist and arm caused him to seek medical advice. In late September he was told that he was suffering from ALS, and that he would die from this disease, most likely within

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Biographical Memoirs, Volume 86 two years; Bill would actually survive for nearly four more years. After learning of his illness, Bill kept a diary from late September through mid-October 1977, which he used to collect his thoughts and help plan for the short future left to him. No one but Bill knew of the diary until after his death. Ruth found it while cleaning out his office. Bill was most concerned about the effect of his illness on Ruth and their children. The diary is laced with the hope that his condition was misdiagnosed. By the end of these weeks, however, with second opinions solicited from doctors across the country, the truth was unambiguous. His right hand and arm were far gone, and damage could already be detected in his other limbs. Eventually the disease would make it impossible for him to talk, and finally lead to suffocation. Later that fall, Illinois’s senior theorist Rudy Marcus was offered an appointment at Caltech, and it soon became clear that he would accept the offer. Bill saw his own failing health together with Marcus’s imminent move as a significant blow to the physical chemistry program at Illinois. He convinced Harry Drickamer and Herb Gutowsky that a recruiting effort was necessary. Drickamer and Gutowsky were the only physical chemistry colleagues who knew of Bill’s condition at the time. In the late 1970s at Illinois, support from Drickamer and Gutowsky was sufficient to proceed. Offers were tendered in the spring of 1978 to the theorist Robert Zwanzig and to the experimentalist George Flynn. Both recruiting efforts failed. The subsequent year furtive plans to attract the British experimentalist Alan Carrington ended quickly when Carrington expressed no interest in leaving England. Attempts aimed at Bill Miller and John Tully proved similarly unsuccessful. Finally, the theorist Peter Wolynes, then an assistant professor at Harvard, accepted an offer to join the Illinois faculty. This move strengthened the theory

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Biographical Memoirs, Volume 86 program at Illinois for a few years, but no similar quality senior appointment was made in experimental chemical physics. Despite the difficulties in recruiting and despite the ominous diagnosis, Bill was determined to make the most of what remained. He published his book Molecular Structure and Dynamics, which is based upon the course that he created to teach entering graduate students a working knowledge of quantum mechanics and spectroscopy. In the late winter of 1978 he began to anticipate how his group’s developments of time-domain microwave spectroscopy might soon lead to the possibility of determining structures of transient or weakly bound molecular species. He and his students imagined studies of van der Waals complexes, such as argon clustering with hydrogen halides. The techniques that would make these studies possible were not yet completely developed. But forever confident, Bill began to make plans for comprehensive studies of many systems, an onslaught on nature not unlike those he had carried out in the 1960s. Unlike that earlier decade, however, Bill would now have neither sufficient energy nor remaining life to properly lead the effort. His group would need another senior scientist. Bill spent considerable time in the fall of 1978 thinking about whom that person might be. He made a decision, and then planned a trip to England, where he would introduce himself to the prospect. Anthony (“Tony”) Legon remembers that he first met Bill on a snowy day in January 1979. Tony was then a young faculty member at University College London, collaborating with D. J. (“Jim”) Millen. Tony and Jim had succeeded at observing and analyzing the rotational spectra of a few hydrogen-bonded complexes, not unlike the systems that Bill hoped to study. Bill turned up at their laboratory and asked Tony whether he was due any sabbatical leave and whether he would like to spend some time in Urbana. Tony

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Biographical Memoirs, Volume 86 answered yes to both questions. They arranged for Tony to arrive in Illinois at the start of the 1979-1980 academic year. The actual arrival date was four months later because Tony’s wife gave birth to their son, Anthony, in November 1979. Between Bill’s visit to London and Tony’s arrival in Urbana, Bill had phoned Tony with “typical Flygare enthusiasm,” Tony recalls. Bill was reporting to Tony the first working of a pulsed-nozzle Fourier-transform microwave spectrometer. Terry Balle had been able to synchronize a microwave π/2 pulse with gas pulsed into a Fabry-Perot cavity. This synchronization was the crucial final element required for this new spectroscopy. It was May 18, 1979, exactly two years to the day before Bill would die. The following day Balle worked with another Flygare student, Ed Campbell, and used the new spectrometer to detect strong rotational transitions of the hydrogen bound Ar-HCl complex. Bill called Tony Legon with this news. “He could see immediately all the wide range of possibilities for the technique and could not contain himself,” Tony says. Bill and his students quickly wrote the first report of this technique. It was published as a communication in the September 15, 1979, issue of the Journal of Chemical Physics. Simultaneously Bill contacted the National Science Foundation and arranged for a creativity extension of his current funding that provided an additional $135,000 per year for the next two years. A series of studies were then carried out on hydrogen halide molecules bound to rare gas atoms. The impressive spectra and structural analysis of these van der Waals molecules formed the basis for research lectures that Bill would give that fall. One of these was given at Columbia University in New York City. While listening to his brilliant presentation, Columbia faculty could see that Bill was not well, and Bill sensed as much. The next morning he was scheduled for meetings at Columbia, but instead he

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Biographical Memoirs, Volume 86 simply returned home to Urbana. George Flynn was among those that Bill was supposed to meet with. George phoned me in Urbana to express his concern. It was no longer possible to hide the sad truth that Bill was dying. On Tony’s arrival in January 1980 the Flygare group moved quickly with his help to apply their new spectrometer to systems with chemically interesting interactions: first CO complexes with HCl, HBr, HF, and next ethene-HX, ethyne-HX, cyclopropane-HX. Bill’s physical condition was rapidly deteriorating, and he could no longer do the experimental work. He was nevertheless an important presence in the laboratory. Tony remembers: “[Bill] was quite ill. He was sitting with me while I was working at the spectrometer. He said: ‘Aren’t you lucky. You are the first person in the Universe to see that molecule.’ His enthusiasm was unattenuated by his condition.” The program of measurements they had mapped out seemed too voluminous to conquer in a reasonable period of time, especially since there was only one of these remarkable spectrometers. The students decided to work in shifts, exploiting this piece of equipment 24 hours a day. These were not the first studies of van der Waals molecules, but they were the most far reaching and comprehensive. A competing group at Harvard using different techniques soon appreciated that they could not match the ease and speed with which the “Balle-Flygare” spectrometer probed these systems. Considering that work today, more than 20 years later, Berkeley spectroscopist Richard Saykally writes, “Bill Flygare’s greatest contribution was the development of the Balle-Flygare Fourier transform microwave spectrometer, which affected nothing less than a total revolution in the field of microwave spectroscopy. The sensitivity, simplicity and generality of this design permit a wide variety of applications…. Perhaps a hundred of these

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Biographical Memoirs, Volume 86 instruments are currently in operation around the world, and are used for the study of molecular species ranging from extremely weakly-bound clusters like KrNe to novel inorganic donor-acceptor complexes.” Results were pouring out, but Bill was no longer able to hold a pen. A year earlier he had switched to writing with his left hand, but now even his left side was incapacitated. In addition, his speech was becoming inaudible, so dictation was becoming problematic. Art Gaylord provided a tool that would enable Bill to continue communicating. Art had recently joined the Illinois technical support staff after obtaining a Berkeley Ph.D. as William Gwinn’s last graduate student. He fashioned one of the original Apple II computers so that Bill could type by simply dropping his hands onto the keyboard. A ball would pass along a menu on the screen, and striking the keyboard instructed the computer to branch to the item adjacent to the ball. The alphabet was one such item, and a touch of the keyboard at that point instructed the printer to type the letter adjacent to the ball. For the next several months Bill would write in this way, one stroke at a time. The group’s results generated significant excitement throughout the chemical physics community. In November 1980 Bill received notification that he had been selected as the next recipient of the Irving Langmuir Award from the American Physical Society. A group of us assembled that afternoon to congratulate Bill for being honored by this most prestigious recognition in chemical physics. He came to the party only briefly, as he was overwhelmed with emotion. It was the only time we observed Bill upset by his illness. Tony Legon recalls: “The [Langmuir] Award provided a focus for all those conflicting thoughts that he must have had at that time and especially because he knew he was a great scientist whose life was about to be cut short at its zenith.”

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Biographical Memoirs, Volume 86 During the next six months Bill’s group would continue its productive march. Tony returned to England in January 1981, but the people working to carry on had now swollen to include seven new students along with those that had been there at the start of the project: Terry Balle, Ed Campbell, and Mike Keenan. Through the weekend of May 16 and 17 Bill remained scientifically active and in touch with his group, but he was having difficulty breathing and his lungs were beginning to fill with fluid. Bill passed away early that rainy Monday morning, at home, in Ruth’s arms. A memorial service was held two days later. Referring to Bill in a written eulogy, Harry Drickamer would quote from Shakespeare’s Hamlet, “He was a man, take him all in all. We shall not look upon his like again.” The next winter the Flygare family scattered Bill’s ashes across the mountainside above Aspen, Colorado, where Bill had so often loved to ski. PROLOGUE AND ACKNOWLEDGMENTS Bill’s life ended more than two decades ago, but his influence continues. Writing this memoir has given me the opportunity to learn many heartfelt things about this influence. His children have all become interesting and productive adults with children of their own. Ruth remains lovely and healthy. She has remarried, to Vern Halberstadt. Vern was a widower. Together they melded a family of six children and ten grandchildren. Much of what is described in this memoir I learned from conversations with Ruth and the materials she provided. Bill’s greatest concerns were for the health and future of his wife and children. It seems clear to me that Bill succeeded at building a foundation for their lives that served them well. Peter Beak remains an active member of the Illinois Chemistry Department. Ben Ware is currently vice-president for research at Syracuse University. John Pochan is a materials

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Biographical Memoirs, Volume 86 scientist with Kodak. Rick Shoemaker is a professor at the Optical Sciences Center of the University of Arizona. J. J. Ewing lives in Seattle, where he is president of Ewing Technology Associates. Tony Legon now lives in Exeter, England, where he is a professor and fellow of the Royal Society. Each of these people has generously written to me describing their work with Bill and the impact his energy and enthusiasm had on their lives. Several others have provided helpful information that I have used in this memoir, including David Buckingham, Henry Ehrenreich, John Flygare, Richard Saykally, and Jeremiah Sullivan.

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Biographical Memoirs, Volume 86 SELECTED BIBLIOGRAPHY 1963 Molecular rotation in the solid state. Theory of rotation of trapped molecules in rare-gas lattices. J. Chem. Phys. 38:2263-2273. 1964 Spin-rotation interaction and magnetic shielding in molecules. J. Chem. Phys. 41:793-800. 1965 With D. W. Hafemeister. Outer shell overlap integrals as a function of distance for halogen-halogen, halogen-alkali, and alkali-alkali ions in the alkali halide lattices. J. Chem. Phys. 43:795-800. 1966 With M. T. Bowers and G. I. Kerley. Vibration-rotation spectra of monomeric HF in the rare gas lattices. J. Chem. Phys. 45:3399-3415. 1967 With R. G. Lett. The microwave spectrum, barrier to internal rotation, 14N nuclear quadrupole interaction, and normal coordinate analysis in methyl-isocyanate, methylisothiocyanate, and methylthiocyanate. J. Chem. Phys. 47:4730-4751. 1968 With W. Huttner and M. K. Lo. The molecular g-value tensor, the molecular susceptibility tensor, sign of the electric dipole moment, and the molecular quadrupole moments in formaldehyde. J. Chem. Phys. 48:1206-1220. 1969 With J. M. Pochan and J. E. Baldwin. Microwave spectrum and structure of cyclopropanone. J. Am. Chem. Soc. 91:1896-1906. With R. L. Shoemaker. Magnetic susceptibility anisotropy, molecular quadrupole moment, molecular g-values, and the sign of the electric dipole moment in methylacetylene. J. Am. Chem. Soc. 91:5417-5422.

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Biographical Memoirs, Volume 86 With D. H. Sutter. The molecular g-values, magnetic susceptibility anisotropies, second moment of the charge distribution, and molecular quadrupole moments in ethylenimine and pyrrolle. J. Am. Chem. Soc. 91:6895-6907. 1971 With R. C. Benson. The molecular Zeeman effect in dimagnetic molecules and the determination of molecular magnetic moments (g-values), magnetic susceptibilities, and molecular quadrupole moments. Mol. Phys. 20:225-250. With B. R. Ware. The simultaneous measurement of the electrophoretic mobility and diffusion coefficient in bovine serum albumin solutions by light scattering. Chem. Phys. Lett. 12:81-86. 1972 With T. D. Gierke and H. L. Tigelaar. The calculation of molecular electric dipole and quadrupole moments. J. Am. Chem. Soc. 94:330-339. 1973 With R. C. Benson. The microwave spectrum, substitutional structure, and the Stark and Zeeman effects in cyclopropeneone. J. Am. Chem. Soc. 95:2772-2782. With T. G. Schmalz and C. L. Norris. Localized magnetic susceptibility anisotropies. J. Am. Chem. Soc. 95:7961-7974. With T. D. Gierke. Depolarized Rayleigh scattering in liquids; molecular reorientation and orientation pair correlations in a nematic liquid crystal. J. Chem. Phys. 61:2231-2240. 1975 With A. K. Burnham and G. R. Alms. The local electric field. I. The effect on isotropic and anisotropic Rayleigh scattering. J. Chem. Phys. 62:3289-3298. 1979 With T. J. Balle, E. J. Campbell, and M. R. Keenan. A new method for observing the rotational spectra of weak molecular complexes: KrHCl. J. Chem. Phys. 671:2723-2724.

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Biographical Memoirs, Volume 86 1981 With T. J. Balle. Fabry-Perot cavity pulsed Fourier transform microwave spectrometer with a pulsed nozzle particle source. Rev. Sci. Instrum. 52:33-45. With M. R. Keenan, L. W. Buxton, E. J. Campbell, and A. C. Legon. Molecular structure of ArDF: An analysis of the bending mode in the rare gas-hydrogen halides. J. Chem. Phys. 74:2133-2137. With P. D. Soper and A. C. Legon. Microwave rotational spectrum, molecular geometry and pairwise interaction potential of the hydrogen-bonded dimer OC-HCl. J. Chem. Phys. 74:2138-2142. With L. W. Buxton and E. J. Campbell. The vibrational ground state rotational spectroscopic constants and structure of the HCN dimer. Chem. Phys. 56:399-406. With A. C. Legon and P. D. Soper. The rotational spectrum, 1H, 19F nuclear spin-nuclear spin coupling, D nuclear quadrupole coupling and molecular geometry of a weakly bound dimer of carbon monoxide and hydrogen fluoride. J. Chem. Phys. 74:4944-4950. With A. C. Legon and P. D. Aldrich. The rotational spectrum and molecular structure of the acetylene-HCl dimer. J. Chem. Phys. 74:625-630. With M. R. Keenan and D. B. Wozniak. Rotational spectrum, structure, and intramolecular force field of the ArClCN van Der Waals complex. J. Chem. Phys. 75:631-640. 1982 With W. G. Read. The microwave spectrum and molecular structure of the acetylene-HF complex. J. Chem. Phys. 76:2238-2246.