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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.

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.)

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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.

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

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

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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

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

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