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Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses (2007)

Chapter: Appendix D International Astronomical Union Spectral Lines of Most Importance Above 300 GHz

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Suggested Citation:"Appendix D International Astronomical Union Spectral Lines of Most Importance Above 300 GHz." National Research Council. 2007. Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses. Washington, DC: The National Academies Press. doi: 10.17226/11719.
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Appendix D
International Astronomical Union Spectral Lines of Most Importance Above 300 GHz

At each triennial meeting of the General Assembly, the International Astronomical Union (IAU) carefully reviews the list of astrophysically most important spectral lines that it maintains. The IAU expresses the need to protect these frequency bands from in-band, band-edge, and harmonic emissions, especially from spaceborne transmitters.

In preparation for World Radiocommunication Conference 2000, which revised the allocations above 71 GHz, a millimeter-wavelength working group of the Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science examined all then-known transitions in the millimeter and submillimeter wavebands. The working group selected a limited number of the astrophysically most important spectral lines to supplement the earlier lists, such as those produced by the IAU, to be used in allocating frequency bands to the Radio Astronomy Service. Spectral lines above 300 GHz are listed in Table D.1. (These data and further information can be found on the Web site of the European Science Foundation’s Committee on Radio Astronomy Frequencies at http://www.astron.nl/craf/iaulist.htm.)

Suggested Citation:"Appendix D International Astronomical Union Spectral Lines of Most Importance Above 300 GHz." National Research Council. 2007. Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses. Washington, DC: The National Academies Press. doi: 10.17226/11719.
×

TABLE D.1 The Most Important Spectral Lines Between 275 and 1000 GHz

Substance

Formula

Frequency (GHz)

Suggested Minimum Band (GHz)

Diazenylium

N2H+

279.511

279.23-279.79

Carbon monosulphide

CS

293.912

292.93-294.21

Hydronium

H3O+

307.192

306.88-307.50

Deuterated water

HDO

313.750

313.44-314.06

Carbon monoxide

C18O

329.330

329.00-329.66

Carbon monoxide

13CO

330.587

329.49-330.92

Carbon monosulphide

CS

342.883

341.74-343.23

Carbon Monoxide

CO

345.796

345.45-346.14

Hydrogen cyanide

HCN

354.484

353.30-354.84

Formylium

HCO+

356.734

355.54-357.09

Oxygen

O2

368.498

368.13-368.87

Diazenylium

N2H+

372.672

372.30-373.04

Water vapor

H2O

380.197

379.82-380.58

Hydronium

H3O+

388.459

388.07-388.85

Carbon monosulphide

CS

391.847

390.54-392.24

Oxygen

O2

424.763

424.34-425.19

Carbon monoxide

C18O

439.088

438.65-439.53

Carbon monoxide

13CO

440.765

439.30-441.21

Carbon monoxide

CO

461.041

459.50-461.50

Heavy water

HDO

464.925

464.46-465.39

Carbon

CI

492.162

490.52-492.65

Hydrogen cyanide

HCN

531.716

529.94-532.25

Carbon monosulphide

CS

538.689

536.89-539.23

Water vapor

H218O

547.676

547.13-548.22

Carbon monoxide

13CO

550.926

549.09-551.48

Water vapor

H2O

556.936

556.38-557.49

Ammonia

15NH3

572.113

571.54-572.69

Ammonia

NH3

572.498

571.93-573.07

Carbon monoxide

CO

576.268

574.35-576.84

Carbon monosulphide

CS

587.616

587.03-588.20

Deuterated water

HDO

599.927

599.33-600.53

Water vapor

H2O

620.700

620.08-621.32

Hydrogen chloride

HCl

625.040

624.41-625.67

Hydrogen chloride

HCl

625.980

625.35-626.61

Carbon monosulphide

CS

636.532

634.41-637.17

Carbon monoxide

13CO

661.067

658.86-661.73

Carbon monoxide

CO

691.473

689.17-692.16

Oxygen

O2

715.393

714.68-716.11

Carbon monosulphide

CS

734.324

733.59-735.06

Water vapor

H2O

752.033

751.28-752.79

Oxygen

O2

773.840

773.07-774.61

Hydrogen cyanide

HCN

797.433

794.77-798.23

Formylium

HCO+

802.653

799.98-803.46

Carbon monoxide

CO

806.652

803.96-807.46

Carbon

C I

809.350

806.65-810.16

Carbon monosulphide

CS

832.057

829.28-832.89

Oxygen

O2

834.146

833.31-834.98

Carbon monosulphide

CS

880.899

877.96-881.78

Water vapor

H2O

916.172

915.26-917.09

Carbon monoxide

CO

921.800

918.72-922.72

Carbon monosulphide

CS

929.723

926.62-930.65

Water vapor

H2O

970.315

969.34-971.29

Carbon monosulphide

CS

978.529

977.55-979.51

Water vapor

H2O

987.927

986.94-988.92

SOURCE: Data and further information can be found at the Web site of the European Science Foundation’s Committee on Radio Astronomy Frequencies at http://www.astron.nl/craf/iaulist.htm, accessed October 26, 2005.

Suggested Citation:"Appendix D International Astronomical Union Spectral Lines of Most Importance Above 300 GHz." National Research Council. 2007. Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses. Washington, DC: The National Academies Press. doi: 10.17226/11719.
×
Page 102
Suggested Citation:"Appendix D International Astronomical Union Spectral Lines of Most Importance Above 300 GHz." National Research Council. 2007. Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses. Washington, DC: The National Academies Press. doi: 10.17226/11719.
×
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The electromagnetic spectrum is a vital part of our environment. Information encoded in the spectrum of radiation arriving at earth from the universe is the means by which we learn about its workings and origin. Radiation collected from the Earth's land, oceans, biosphere, and atmosphere provide us with much of the data needed to better understand this environment. Wise use of the spectrum is necessary if we are to continue these advances in scientific understanding. To help guide this effort, the NSF and NASA asked the NRC to develop a set of principles for fostering effective allocation and protection of spectral bands for scientific research. This handbook contains practical information in this connection including a description of regulatory bodies and issues, a discussion of the relevant scientific background, a list of science spectrum allocations in the United States, and an analysis of spectrum protection issues.

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