IAU list of important spectral lines

Supplementary list of important spectral lines (II)

In preparation of the World Radiocommunication Conference 2000, WRC-2000, which revised the allocations above 71 GHz, the IUCAF mm-wavelength working group has examined all known transitions in the millimeter and submillimeter wavebands. They have selected a limited number of the astrophysically most important spectral lines. 

This list supplements earlier lists such as those produced by the International Astronomical Union, IAU, (see previous page) and is to be used in allocating frequency bands to the Radio Astronomy Service.     

Supplementary list of important spectral lines

Substance

Rest Frequency

Suggested

minimum bandwidth

Deuterium (DI)

 327.348 MHz 327 - 327.7 MHz

Hydrogen (HI)

1420.406

 MHz 1370.0 - 1427 MHz

Hydroxyl radical (OH)

 1612.231 MHz 1606.8 - 1613.8 MHz

Hydroxyl radical (OH)

 1665.402 MHz 1659.8 - 1667.1 MHz

Hydroxyl radical (OH)

 1667.359 MHz 1661.8 - 1669 MHz

Hydroxyl radical (OH)

 1720.53 MHz 1714.8 - 1722.2 MHz

Methyladyne (CH)

 3263.794 MHz 3242.4 - 3267.1 MHz

Methyladyne (CH)

 3335.481 MHz 3324.4 - 3338.8 MHz

Methyladyne (CH)

 3349.193 MHz 3338 - 3352.5 MHz

Formaldehyde (H2CO)

 4829.66 MHz 4813.6 - 4834.5 MHz

Methanol (CH3OH)

 6668.518 MHz 6661.8 - 6675.2 MHz

Helium (3He+)

 8665.65 MHz 8657 - 8674.3 MHz

Methanol (CH3OH)

 12.178 GHz 12.17 - 12.19 GHz

Formaldehyde (H2CO)

 14.488 GHz 14.44 - 14.5 GHz

Cyclopropenylidene (C3H2)

 18.343 GHz 18.28 - 18.36 GHz

Cyclopropenylidene (C3H2)

 21.587 GHz 21.56 - 21.61 GHz

Water vapor (H2O)

 22.235 GHz 22.16 - 22.26 GHz

Dicarbon monosulphide (CCS)

 22.344 GHz 22.32 - 22.37 GHz

Ammonia (NH3)

 23.694 GHz 23.61 - 23.72 GHz

Ammonia (NH3)

 23.723 GHz 23.64 - 23.75 GHz

Ammonia (NH3)

 23.87 GHz 23.79 - 23.89 GHz

Ammonia (NH3)

 24.139 GHz 24.11 - 24.16 GHz

Methanol (CH3OH)

 36.169 GHz 36.13 - 36.21 GHz

Cyanoacetylene (HC3N)

 36.392 GHz 36.36 - 36.43 GHz

Silicon monoxide (SiO)

 42.821 GHz 42.78 - 42.86 GHz

Silicon monoxide (SiO)

 43.122 GHz 43.08 - 43.17 GHz

Silicon monoxide (SiO)

 43.424 GHz 43.38 - 43.47 GHz

Dicarbon monosulphide (CCS)

 45.379 GHz 45.33 - 45.42 GHz

Cyanoacetylene (HC3N)

 45.49 GHz 45.44 - 45.54 GHz

Carbon monosulphide (13CS)

 46.247 GHz 46.20 - 46.29 GHz

Carbon monosulphide (C34S)

 48.207 GHz 48.16 - 48.26 GHz

Carbon monosulphide (CS)

 48.991 GHz 48.83 - 49.04 GHz

Oxygen (O2)

 56.265 GHz 56.21 - 56.32 GHz

Oxygen (O2)

 58.324 GHz 58.27 - 58.38 GHz

Oxygen (O2)

 58.446 GHz 58.39 - 58.5 GHz

Oxygen (O2)

 59.164 GHz 59.10 - 59.22 GHz

Oxygen (O2)

 59.591 GHz 59.53 - 59.65 GHz

Oxygen (O2)

 60.306 GHz 60.25 - 60.37 GHz

Oxygen (O2)

 60.434 GHz 60.37 - 60.49 GHz

Oxygen (O2)

 61.151 GHz 61.09 - 61.21 GHz

Oxygen (O2)

 62.486 GHz 62.42 - 62.55 GHz

Deuterated formylium (DCO+)

 72.039 GHz 71.97 - 72.11 GHz

Deuterium cyanide (DCN)

 72.415 GHz 72.34 - 72.49 GHz

Cyanoacetylene (HC3N)

 72.784 GHz 72.71 - 72.86 GHz

Methyl cyanide (CH3CN)

 73.59 GHz 73.51 - 73.66 GHz

Deuterated water (HDO)

 80.578 GHz 80.50 - 80.66 GHz

Cyanoacetylene (HC3N)

 81.881 GHz 81.80 - 81.96 GHz

Cyclopropenylidene (C3H2)

 82.966 GHz 82.88 - 83.05 GHz

Cyclopropenylidene (C3H2)

 85.339 GHz 85.05 - 85.42 GHz

Methyl acetylene (CH3CCH)

 85.5 GHz 85.41 - 85.59 GHz

Deuterated Ammonia (NH2D)

 85.926 GHz 85.84 - 86.01 GHz

Hydrogen cyanide (HC15N)

 86.055 GHz 85.97 - 86.14 GHz

Silicon monoxide (SiO)

 86.243 GHz 86.16 - 86.33 GHz

Hydrogen cyanide (H13CN)

 86.34 GHz 86.25 - 86.43 GHz

Formylium (H13CO+)

 86.754 GHz 86.67 - 86.84 GHz

Hydrogen isocyanide (HN13C)

 87.091 GHz 87.00 - 87.18 GHz

Silicon monoxide (SiO)

 86.847 GHz 86.76 - 86.93 GHz

Ethynyl radical (C2H)

 87.3 GHz 87.21 - 87.39 GHz

Hydrogen cyanide (HCN)

 88.632 GHz 88.34 - 88.72 GHz

Hydrogen isocyanide (H15NC)

 88.866 GHz 88.78 - 88.95 GHz

Formylium (HCO+)

 89.189 GHz 88.89 - 89.28 GHz

Hydrogen isocyanide (HNC)

 90.664 GHz 90.57 - 90.75 GHz

Cyanoacetylene (HC3N)

 90.979 GHz 90.89 - 91.07 GHz

Methyl cyanide (CH3CN)

 91.98 GHz 91.88 - 92.07 GHz

Carbon monosulphide (13CS)

 92.494 GHz 92.40 - 92.59 GHz

Diazenylium (N2H+)

 93.174 GHz 93.08 - 93.27 GHz

Carbon monosulphide (C34S)

 96.413 GHz 96.32 - 96.51 GHz

Carbon monosulphide (CS)

 97.981 GHz 97.65 - 98.08 GHz

Sulphur monoxide (SO)

 99.3 GHz 99.20 - 99.4 GHz

Cyanoacetylene (HC3N)

 100.076 GHz 99.98 - 100.18 GHz

Methyl acetylene (CH3CCH)

 102.5 GHz 102.39 - 102.6 GHz

Cyanoacetylene (HC3N)

 109.174 GHz 109.06 - 109.28 GHz

Sulphur monoxide (SO)

 109.252 GHz 109.14 - 109.36 GHz

Carbon monoxide (C18O)

 109.782 GHz 109.67 - 109.89 GHz

Deuterated Ammonia (NH2D)

 110.153 GHz 110.04 - 110.26 GHz

Carbon monoxide (13CO)

 110.201 GHz 119.83 - 110.31 GHz

Methyl cyanide (CH3CN)

 110.38 GHz 110.27 - 110.49 GHz

Carbon monoxide (C17O)

 112.359 GHz 112.25 - 112.47 GHz

Cyano radical (CN)

 113.5 GHz 113.39 - 113.61 GHz

Carbon monoxide (CO)

 115.271 GHz 114.88 - 115.39 GHz

Oxygen (O2)

 118.75 GHz 118.63 - 118.87 GHz

Silicon monoxide (SiO)

 127.269 GHz 127.14 - 127.4 GHz

Formaldehyde (H213CO)

 137.45 GHz 137.31 - 137.59 GHz

Carbon monosulphide (13CS)

 138.739 GHz 138.60 - 138.88 GHz

Formaldehyde (H2CO)

 140.84 GHz 140.69 - 140.98 GHz

Deuterated formylium (DCO+)

 144.077 GHz 143.93 - 144.22 GHz

Deuterium cyanide (DCN)

 144.828 GHz 144.68 - 144.97 GHz

Formaldehyde (H2CO)

 145.603 GHz 145.45 - 145.75 GHz

Carbon monosulphide (CS)

 146.969 GHz 146.48 - 147.12 GHz

Methyl cyanide (CH3CN)

 147.17 GHz 147.02 - 147.32 GHz

Nitric oxide (NO)

 150.4 GHz 149.95 - 150.85 GHz

Formaldehyde (H2CO)

 150.498 GHz 150.35 - 150.65 GHz

Methyl acetylene (CH3CCH)

 153.8 GHz 153.64 - 153.95 GHz

Cyanoacetylene (HC3N)

 154.657 GHz 154.5 - 154.81 GHz

Cyanoacetylene (HC3N)

 163.753 GHz 163.59 - 163.92 GHz

Hydrogen sulphide (H2S)

 168.76 GHz 168.59 - 168.93 GHz

Silicon monoxide (SiO)

 173.688 GHz 173.51 - 173.86 GHz

Water vapor (H2O)

 183.31 GHz 183.13 - 183.49 GHz

Carbon monosulphide (CS)

 195.954 GHz 195.30 - 196.15 GHz

Water vapor (H218O)

 203.132 GHz 202.93 - 203.34 GHz

Sulphur monoxide (SO)

 206.176 GHz 205.97 - 206.38 GHz

Sulphur monoxide (SO)

 215.221 GHz 215.01 - 215.44 GHz

Deuterated formylium (DCO+)

 216.113 GHz 215.90 - 216.33 GHz

Silicon monoxide (SiO)

 217.105 GHz 216.89 - 217.32 GHz

Deuterium cyanide (DCN)

 217.239 GHz 217.02 - 217.46 GHz

Formaldehyde (H2CO)

 218.222 GHz 218.00 - 218.44 GHz

Carbon monoxide (C18O)

 219.56 GHz 219.34 - 219.78 GHz

Carbon monoxide (13CO)

 220.399 GHz 219.67 - 220.62 GHz

Methyl cyanide (CH3CN)

 220.7 GHz 220.48 - 220.92 GHz

Sulphur dioxide (SO2)

 221.965 GHz 221.74 - 222.19 GHz

Methyl acetylene (CH3CCH)

 222.1 GHz 221.87 - 222.32 GHz