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Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses Second Edition (2015) / Chapter Skim
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Appendix C: International Astronomical Union Spectral Lines of Most Importance Below 300 GHz
Pages 237-240

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From page 237...
... Spectral lines below 300 GHz are listed in Table C.1. Unless otherwise noted, the suggested minimum band limits are Doppler-shifted frequencies corresponding to radial velocities of ±300 km/s, consistent with line radiation occurring in our Milky Way galaxy.
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From page 238...
... Deuterium Di 0.327384 0.327-0.3277 P Hydrogen Hi 1.420406 1.370-1.427 S 1.33-1.40 2, 3 P 1.40-1.427 Hydroxyl radical OH 1.612231 1.6068-1.6138 P 1.6106-1.6138 4 1.665402 1.6598-1.6671 P 1.66-1.67 4 1.667359 1.6618-1.6690 4 Hydroxyl radical OH 1.720530 1.7148-1.7222 S 1.7188-1.7222 3, 4 Methyladyne CH 3.263794 3.2424-3.2671 S 3.260-3.267 3, 4 3.335481 3.3244-3.3388 S 3.332-3.339 3, 4 3.349193 3.3380-3.3525 S 3.3458-3.3525 3, 4 Formaldehyde H2CO 4.829660 4.8136-4.8345 S 4.8-4.9 3, 4 Methanol CH3OH 6.668518 6.6618-6.6752 S 6.650-6.6752 3 Helium 3He + 8.665650 8.6570-8.6743 3, 6 Methanol CH3OH 12.178 12.17-12.19 3, 6 Formaldehyde H2CO 14.488 14.44-14.50 S 14.47-14.50 3, 4 Cyclopropenylidene C 3H 2 18.343 18.28-18.36 3, 4, 6 Water vapor H 2O 22.235 22.16-22.26 F 22.01-22.21 3, 4 P 22.21-22.50 Ammonia NH3 23.694 23.61-23.71 P 23.60-24.00 4 23.723 23.64-23.74 4 23.870 23.79-23.89 4 Sulphur monoxide SO 30.002 29.97-30.03 6 Methanol CH3OH 36.169 36.13-36.21 P 36-37 6 Silicon monoxide SiO 42.519 42.47-42.57 F 42.77-42.87 6, 8 42.821 42.78-42.86 F 43.07-43.17 43.122 43.08-43.17 F 43.37-43.47 43.424 43.38-43.47 Dicarbon monosulphide CCS 45.379 45.33-45.42 6 Carbon monosulphide CS 48.991 48.94-49.04 P 48.94-49.04 Oxygen O2 61.1 56.21-63.06 P 58.2-59.0 5, 6, 7 Deuterated water HDO 80.578 80.50-80.66 Cyclopropenylidene C 3H 2 85.339 85.05-85.42 Silicon monoxide SiO 86.243 86.16-86.33 P Formylium H13CO+ 86.754 86.67-86.84 P Silicon monoxide SiO 86.847 86.76-86.93 P Ethynyl radical C 2H 87.300 87.21-87.39 P 5 Hydrogen cyanide HCN 88.632 88.34-88.72 P 4 Formylium HCO++ 89.189 88.89-89.28 P 4 Hydrogen isocyanide HNC 90.664 90.57-90.75 P continued
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From page 239...
... Diazenylium N2 H+ 93.174 93.08-93.27 Carbon monosulphide CS 97.981 97.65-98.08 4 Sulfur monoxide SO 99.300 99.20-99.40 Methyl acetylene CH3CCH 102.5 102.39-102.60 5 Methanol CH3OH 107.014 106.91-107.12 Carbon monoxide C18O 109.782 109.67-109.89 P Carbon monoxide 13CO 110.201 110.83-110.31 P 4 Carbon monoxide C17O 112.359 112.25-112.47 P 6 Cyano radical CN 113.500 113.39-113.61 P 5 Carbon monoxide CO 115.271 114.88-115.39 P 4 Oxygen O2 118.750 118.63-118.87 P 116-126 7 Formaldehyde H2 13CO 137.450 137.31-137.59 6 Formaldehyde H2CO 140.840 140.69-140.98 P Carbon monosulphide CS 146.969 146.48-147.12 P 146.82-147.12 Nitric oxide NO 150.4 149.95-150.85 S 150-151 5 Methanol CH3OH 156.602 156.45-156.76 Water vapor H 2O 183.310 183.13-183.49 Carbon monoxide C18O 219.560 219.34-219.78 P Carbon monoxide 13CO 220.399 219.67-220.62 P 4 Cyano radical CN 226.600 226.37-226.83 P 5 Cyano radical CN 226.800 226.57-227.03 P 5 Carbon monoxide CO 230.538 229.77-230.77 P 4 Carbon monosulphide CS 244.953 244.14-245.20 6 Nitric oxide NO 250.6 250.35-250.85 P 5 Ethynyl radical C 2H 262.000 261.74-262.26 5 Hydrogen cyanide HCN 265.886 265.00-266.15 Formylium HCO++  267.557 266.66-267.82 Hydrogen isocyanide HNC 271.981 271.71-272.25 Diazenylium N2 H+ 279.511 279.23-279.79 Carbon monosulphide CS 293.912 292.93-294.21 NOTES: 1. If Notes 2 or 4 are not listed, then the band limits are the Doppler-shifted frequencies corresponding to radial velocities of ± 300 km/s (consistent with line radiation occurring in our Milky Way galaxy)
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From page 240...
... Protection for observations conducted in this portion of the band may not be practicable. SOURCE: Data and further information can be found in the International Telecommunication Union, RA 314 Series: Preferred Frequency Bands for Radio Astronomical Measurements, June 2003, http://www.itu.int/dms_pubrec/itu-r/rec/ra/ R-­REC-RA.314-10-200306-I!
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Key Terms

  • spectral lines
  • carbon monosulphide
  • cyano radical
  • suggested minimum
  • radial velocities

  • minimum band
  • silicon monoxide
  • radio astronomy
  • frequency bands
  • band limits

  • frequencies corresponding
  • line radiation
  • frequency allocations
  • lines below
  • radiation occurring

  • astronomy service
  • allocating frequency
  • world radiocommunication
  • otherwise noted
  • radio astronomical

  • doppler shifts
  • extends outside
  • submillimeter wavebands
  • international telecommunication
  • scientific committee

  • space science
  • astronomical measurements
  • line extends
  • dicarbon monosulphide
  • band allocated


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