Radio frequencies of the most important astrophysical spectral lines
- 1. IAU list of important spectral lines
- 2. Supplementary list of important spectral lines of the IUCAF mm-wave working group
1. IAU list of important spectral lines
At the XXIst General Assembly of the International Astronomical Union, IAU, (Buenos Aires, July 23 – August 1, 1991) the astrophysically most important spectral lines have been carefully reviewed. The IAU listed the revision of these spectral lines as reproduced below. The IAU expressed the need to protect these frequency bands from in-band, band-edge and harmonic emissions, especially from space-borne transmitters.
| Substance | Rest Frequency | Suggested Minimum Bandwidth | Notes |
| Deuterium (DI) | 327.384 MHz | 327.0 – 327.7 MHz | |
| Hydrogen (HI) | 1420.406 MHz | 1370.0 – 1427.0 MHz | (2),(3) |
| Hydroxyl radical (OH) | 1612.231 MHz | 1606.8 – 1613.8 MHz | (3),(4) |
| Hydroxyl radical (OH) | 1665.402 MHz | 1659.8 – 1667.1 MHz | (4) |
| Hydroxyl radical (OH) | 1667.359 MHz | 1661.8 – 1669.0 MHz | (4) |
| Hydroxyl radical (OH) | 1720.530 MHz | 1714.8 – 1722.2 MHz | (3),(4) |
| Methyladyne (CH) | 3263.794 MHz | 3252.9 – 3267.1 MHz | (3),(4) |
| Methyladyne (CH) | 3335.481 MHz | 3324.4 – 3338.8 MHz | (3),(4) |
| Methyladyne (CH) | 3349.193 MHz | 3338.0 – 3352.5 MHz | (3),(4) |
| Formaldehyde (H₂CO) | 4829.660 MHz | 4813.6 – 4834.5 MHz | (3),(4) |
| Methanol (CH₂OH) | 6668.518 MHz | 6661.8 – 6675.2 MHz | (3),(6) |
| Ionized Helium Isotope (³HeII) | 8665.650 MHz | 8660.0 – 8670.0 MHz | |
| Methanol (CH₃OH) | 12.178 GHz | 12.17 – 12.19 GHz | (3),(6) |
| Formaldehyde (H₂CO) | 14.488 GHz | 14.44 – 14.50 GHz | (3),(4) |
| Cyclopropenylidene (C₃H₂) | 18.343 GHz | 18.28 – 18.36 GHz | (3),(4),(6) |
| Water Vapour (H₂O) | 22.235 GHz | 22.16 – 22.26 GHz | (3),(4) |
| Ammonia (NH₃) | 23.694 GHz | 23.61 – 23.71 GHz | (4) |
| Ammonia (NH₃) | 23.723 GHz | 23.64 – 23.74 GHz | (4) |
| Ammonia (NH₃) | 23.870 GHz | 23.79 – 23.89 GHz | (4) |
| Silicon monoxide (SiO) | 42.519 GHz | 42.47 – 42.57 GHz | (3) |
| Silicon monoxide (SiO) | 42.821 GHz | 42.77 – 42.86 GHz | |
| Silicon monoxide (SiO) | 42.880 GHz | 42.83 – 42.93 GHz | |
| Silicon monoxide (SiO) | 43.122 GHz | 43.07 – 43.17 GHz | |
| Silicon monoxide (SiO) | 43.424 GHz | 43.37 – 43.47 GHz | |
| Carbon monosulphide (CS) | 48.991 GHz | 48.94 – 49.04 GHz | |
| Deuterated formylium (DCO⁺) | 72.039 GHz | 71.96 – 72.11 GHz | (3) |
| Silicon monoxide (SiO) | 86.243 GHz | 86.16 – 86.33 GHz | |
| Formylium (H¹³CO⁺) | 86.754 GHz | 86.66 – 86.84 GHz | |
| Silicon monoxide (SiO) | 86.847 GHz | 86.76 – 86.93 GHz | |
| Ethynyl radical (C₂H) | 87.300 GHz | 87.21 – 87.39 GHz | (5) |
| Hydrogen cyanide (HCN) | 88.632 GHz | 88.34 – 88.72 GHz | (4) |
| Formylium (HCO⁺) | 89.189 GHz | 88.89 – 89.28 GHz | (4) |
| Hydrogen isocyanide (HNC) | 90.664 GHz | 90.57 – 90.76 GHz | |
| Diazenylium (N₂H) | 93.174 GHz | 93.07 – 93.27 GHz | |
| Carbon monosulphide (CS) | 97.981 GHz | 97.65 – 98.08 GHz | (4) |
| Carbon monoxide (C¹⁸O) | 109.782 GHz | 109.67 – 109.89 GHz | |
| Carbon monoxide (C¹³CO) | 110.201 GHz | 109.83 – 110.31 GHz | (4) |
| Carbon monoxide (C¹⁷O) | 112.359 GHz | 112.25 – 112.47 GHz | (6) |
| Carbon monoxide (CO) | 115.271 GHz | 114.88 – 115.39 GHz | (4) |
| Formaldehyde (H₂¹³CO) | 137.450 GHz | 137.31 – 137.59 GHz | (3),(6) |
| Formaldehyde (H₂CO) | 140.840 GHz | 140.69 – 140.98 GHz | |
| Carbon monosulphide (CS) | 146.969 GHz | 146.82 – 147.12 GHz | |
| Water vapour (H₂O) | 183.310 GHz | 183.12 – 183.50 GHz | |
| Carbon monoxide (C¹⁸O) | 219.560 GHz | 219.34 – 219.78 GHz | |
| Carbon monoxide (C¹³CO) | 220.399 GHz | 219.67 – 220.62 GHz | (4) |
| Carbon monoxide (CO) | 230.538 GHz | 229.77 – 230.77 GHz | (4) |
| Carbon monosulphide (CS) | 244.953 GHz | 244.72 – 245.20 GHz | (6) |
| Hydrogen cyanide (HCN) | 265.886 GHz | 265.62 – 266.15 GHz | |
| Formylium (HCO⁺) | 267.557 GHz | 267.29 – 267.83 GHz | |
| Hydrogen isocyanide (HNC) | 271.981 GHz | 271.71 – 272.25 GHz | |
| Dyazenulium (N₂H⁺) | 279.511 GHz | 279.23 – 279.79 GHz | |
| Carbon monoxide (C¹⁸O) | 312.330 GHz | 329.00 – 329.66 GHz | |
| Carbon monoxide (C¹³CO) | 330.587 GHz | 330.25 – 330.92 GHz | |
| Carbon monosulphide (CS) | 342.883 GHz | 342.54 – 343.23 GHz | |
| Carbon monoxide (CO) | 345.796 GHz | 345.45 – 346.14 GHz | |
| Hydrogen cyanide (HCN) | 354.484 GHz | 354.13 – 354.84 GHz | |
| Formylium (HCO⁺) | 356.734 GHz | 356.37 – 357.09 GHz | |
| Dyazenulium (N₂H⁺) | 372.672 GHz | 372.30 – 373.05 GHz | |
| Water vapour (H₂O) | 380.197 GHz | 379.81 – 380.58 GHz | |
| Carbon monoxide (C¹⁸O) | 439.088 GHz | 438.64 – 439.53 GHz | |
| Carbon monoxide (C¹³CO) | 440.765 GHz | 440.32 – 441.21 GHz | |
| Carbon monoxide (CO) | 461.041 GHz | 460.57 – 461.51 GHz | |
| Heavy water (HDO) | 464.925 GHz | 464.46 – 465.39 GHz | |
| Carbon (CI) | 492.162 GHz | 491.66 – 492.66 GHz | |
| Water vapour (H₂¹⁸O) | 547.676 GHz | 547.13 – 548.22 GHz | |
| Water vapour (H₂O) | 556.936 GHz | 556.37 – 557.50 GHz | |
| Ammonia (¹⁵NH₃) | 572.113 GHz | 571.54 – 572.69 GHz | |
| Ammonia (NH₃) | 572.498 GHz | 571.92 – 573.07 GHz | |
| Carbon monoxide (CO) | 691.473 GHz | 690.78 – 692.17 GHz | |
| Hydrogen cyanide (HCN) | 797.433 GHz | 796.64 – 789.23 GHz | |
| Formylium (HCO⁺) | 802.653 GHz | 801.85 – 803.85 GHz | |
| Carbon monoxide (CO) | 806.652 GHz | 805.85 – 807.46 GHz | |
| Carbon (CI) | 809.350 GHz | 808.54 – 810.16 GHz | |
| 1): If Note 4) or Note 2) are not listed, the band limits are Doppler-shifted frequencies corresponding to radial velocities of +/- 300 km/s (consistent with line radiation occurring in our galaxy). 2): An extension to lower frequencies of the allocation of 1400-1427 MHz is required to allow for the Doppler shifts for HI observed in distant galaxies. 3): The current international allocation is not primary and/or does not meet bandwidth requirements. See: ITU-R Radio Regulations (Table 8) for more detailed information. 4): Because these line frequencies are also being used for observing other galaxies, the listed bandwidths include Doppler shifts corresponding to radial velocities of up to 1000 km/s. It should be noted that HI has been observed at frequencies redshifted to 500 MHz, while some lines of the most abundant molecules have been detected in galaxies with velocities up to 50 000 km/s, corresponding to a frequency reduction of up to 17%. 5): There are six closely spaced lines associated with this molecule at this frequency. The listed band is wide enough to permit observations of all six lines. 6): This line is not mentioned in Article 8 of the ITU-R Radio Regulations. |
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2. Supplementary list of important spectral lines of the IUCAF mm-wave working group
In preparation for the World Radiocommunication Conference 2000 (WRC-2000), which revised allocations above 71 GHz, the IUCAF mm-wavelengths Working Group examined all known transitions in the millimetre and sub-millimetre wavelengths. It selected a limited number of the most important astrophysical spectral lines.
This list supplements earlier lists, such as that produced by the International Astronomical Union, IAU, (see above), and is to be used for the allocation of frequency bands to the Radio Astronomy Service.
| Substance | Rest Frequency | Suggested Minimum Bandwidth |
|---|---|---|
| Deuterium (DI) | 327.348 MHz | 327.0 – 327.7 MHz |
| Hydrogen (HI) | 1420.406 MHz | 1370.0 – 1427.0 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 – 1669.0 MHz |
| Hydroxyl radical (OH) | 1720.530 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 | 3338.0 – 3352.5 MHz |
| Formaldehyde (H2CO) | 4829.660 MHz | 4813.6 – 4834.5 MHz |
| Methanol (CH3OH) | 6668.518 MHz | 6661.8 – 6675.2 MHz |
| Helium (3He+) | 8665.650 MHz | 8657.0 – 8674.3 MHz |
| Methanol (CH3OH) | 12.178 GHz | 12.17 – 12.19 GHz |
| Formaldehyde (H2CO) | 14.488 GHz | 14.44 – 14.50 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) | 23.870 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) | 42.519 GHz | 42.47 – 42.57 GHz |
| Silicon monoxide (SiO) | 42.821 GHz | 42.77 – 42.86 GHz |
| Silicon monoxide (SiO) | 42.880 GHz | 42.83 – 42.93 GHz |
| Silicon monoxide (SiO) | 43.122 GHz | 43.07 – 43.17 GHz |
| Silicon monoxide (SiO) | 43.424 GHz | 43.37 – 43.47 GHz |
| Dicarbon monosulphide (CCS) | 45.379 GHz | 45.33 – 45.42 GHz |
| Cyanoacetylene (HC3N) | 45.490 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 – 58.50 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) | 86.340 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) | 87.300 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) | 99.300 GHz | 99.20 – 99.40 GHz |
| Cyanoacetylene (HC3N) | 100.076 GHz | 99.98 – 100.18 GHz |
| Methyl acetylene (CH3CCH) | 102.5 GHz | 102.39 – 102.60 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) | 113.500 GHz | 113.39 – 113.61 GHz |
| Carbon monoxide (CO) | 115.271 GHz | 114.88 – 115.39 GHz |
| Oxygen (O2) | 118.750 GHz | 118.63 – 118.87 GHz |
| Silicon monoxide (SiO) | 127.269 GHz | 127.14 – 127.40 GHz |
| Formaldehyde (H213CO) | 137.450 GHz | 137.31 – 137.59 GHz |
| Carbon monosulphide (13CS) | 138.739 GHz | 138.60 – 138.88 GHz |
| Formaldehyde (H2CO) | 140.840 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 | 154.50 – 154.81 GHz |
| Cyanoacetylene (HC3N) | 163.753 GHz | 163.59 – 163.92 GHz |
| Hydrogen sulphide (H2S) | 168.760 GHz | 168.59 – 168.93 GHz |
| Silicon monoxide (SiO) | 173.688 GHz | 173.51 – 173.86 GHz |
| Water vapor (H2O) | 183.310 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) | 219.560 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 |
| Carbon monoxide (C17O) | 224.714 GHz | 224.49 – 224.94 GHz |
| Sulphur dioxide (SO2) | 225.154 GHz | 224.93 – 225.38 GHz |
| Deuterated water (HDO) | 225.897 GHz | 225.67 – 226.12 GHz |
| Cyano radical (CN) | 226.600 GHz | 226.37 – 226.83 GHz |
| Cyano radical (CN) | 226.800 GHz | 226.57 – 227.03 GHz |
| Carbon monoxide (CO) | 230.538 GHz | 229.77 – 230.77 GHz |
| Carbon monosulphide (13CS) | 231.221 GHz | 230.99 – 231.45 GHz |
| Carbon monosulphide (C34S) | 241.016 GHz | 240.77 – 241.26 GHz |
| Deuterated water (HDO) | 241.562 GHz | 241.32 – 241.80 GHz |
| Methanol (CH3OH) | 241.700 GHz | 241.46 – 241.94 GHz |
| Methanol (CH3OH) | 241.767 GHz | 241.53 – 242.01 GHz |
| Methanol (CH3OH) | 241.791 GHz | 241.55 – 242.03 GHz |
| Methanol (CH3OH) | 241.842 GHz | 241.60 – 242.08 GHz |
| Carbon monosulphide (CS) | 244.953 GHz | 244.14 – 245.20 GHz |
| Nitric oxide (NO) | 250.6 GHz | 250.35 – 250.85 GHz |
| Sulphur dioxide (SO2) | 251.211 GHz | 250.96 – 251.46 GHz |
| Methyl cyanide (CH3CN) | 257.5 GHz | 257.24 – 257.76 GHz |
| Hydrogen cyanide (H13CN) | 259.012 GHz | 258.75 – 259.27 GHz |
| Formylium (H13CO+) | 260.255 GHz | 259.99 – 260.52 GHz |
| Silicon monoxide (SiO) | 260.518 GHz | 260.26 – 260.78 GHz |
| Hydrogen isocyanide (HN13C) | 261.263 GHz | 261.00 – 261.52 GHz |
| Ethynyl radical (C2H) | 262.000 GHz | 261.74 – 262.26 GHz |
| Sulphur dioxide (SO2) | 262.334 GHz | 262.07 – 262.60 GHz |
| Hydrogen cyanide (HCN) | 265.886 GHz | 265.00 – 266.15 GHz |
| Formylium (HCO+) | 267.557 GHz | 266.66 – 267.82 GHz |
| Hydrogen isocyanide (HNC) | 271.981 GHz | 271.71 – 272.25 GHz |
| Carbon monosulphide (13CS) | 277.455 GHz | 277.18 – 277.73 GHz |
| Diazenylium (N2H+) | 279.511 GHz | 279.23 – 279.79 GHz |
| Carbon monosulphide (C34S) | 289.209 GHz | 288.92 – 289.50 GHz |
| Sodium hydride (NaH) | 289.860 GHz | 289.57 – 290.15 GHz |
| Carbon monosulphide (CS) | 293.912 GHz | 292.93 – 294.21 GHz |
| Hydronium (H3O+) | 307.192 GHz | 306.88 – 307.50 GHz |
| Carbon monosulphide (13CS) | 323.685 GHz | 323.36 – 324.01 GHz |
| Water vapor (H2O) | 325.153 GHz | 324.83 – 325.48 GHz |
| Heavy water (HDO) | 313.750 GHz | 313.44 – 314.06 GHz |
| Carbon monoxide (C18O) | 329.330 GHz | 329.00 – 329.66 GHz |
| Carbon monoxide (13CO) | 330.587 GHz | 329.49 – 330.92 GHz |
| Carbon monosulphide (C34S) | 337.397 GHz | 337.06 – 337.73 GHz |
| Cyano radical (CN) | 340.030 GHz | 339.69 – 340.37 GHz |
| Cyano radical (CN) | 340.250 GHz | 339.91 – 340.59 GHz |
| Carbon monosulphide (CS) | 342.883 GHz | 341.74 – 343.23 GHz |
| Hydrogen cyanide (HC15N) | 344.200 GHz | 343.86 – 344.54 GHz |
| Magnesium hydride (MgH) | 344.305 GHz | 343.96 – 344.65 GHz |
| Hydrogen cyanide (H13CN) | 344.340 GHz | 344.00 – 344.68 GHz |
| Carbon monoxide (CO) | 345.796 GHz | 344.64 – 346.14 GHz |
| Formylium (H13CO+) | 346.999 GHz | 346.65 – 347.35 GHz |
| Silicon monoxide (SiO) | 347.331 GHz | 346.98 – 347.68 GHz |
| Ethynyl radical (C2H) | 349.340 GHz | 348.99 – 349.69 GHz |
| Ethynyl radical (C2H) | 349.390 GHz | 349.04 – 349.74 GHz |
| Hydrogen cyanide (HCN) | 354.484 GHz | 353.30 – 354.84 GHz |
| Formylium (HCO+) | 356.734 GHz | 355.54 – 357.09 GHz |
| Hydrogen isocyanide (HNC) | 362.630 GHz | 362.27 – 362.99 GHz |
| Hydronium (H3O+) | 364.797 GHz | 364.43 – 365.16 GHz |
| Oxygen (O2) | 368.498 GHz | 368.13 – 368.87 GHz |
| Carbon monosulphide (13CS) | 369.908 GHz | 369.54 – 370.28 GHz |
| H2D+ | 372.421 GHz | 372.05 – 372.79 GHz |
| Diazenylium (N2H+) | 372.672 GHz | 372.30 – 373.04 GHz |
| Water vapor (H2O) | 380.197 GHz | 379.82 – 380.58 GHz |
| Carbon monosulphide (C34S) | 385.578 GHz | 385.19 – 385.96 GHz |
| Hydronium (H3O+) | 388.459 GHz | 388.07 – 388.85 GHz |
| Water vapor (H218O) | 390.608 GHz | 390.22 – 391.00 GHz |
| Silicon monoxide (SiO) | 390.728 GHz | 390.34 – 391.12 GHz |
| Carbon monosulphide (CS) | 391.847 GHz | 390.54 – 392.24 GHz |
| Hydronium (H3O+) | 396.272 GHz | 395.88 – 396.67 GHz |
| Carbon monosulphide (13CS) | 416.123 GHz | 415.71 – 416.54 GHz |
| Oxygen (O2) | 424.763 GHz | 424.34 – 425.19 GHz |
| Hydrogen cyanide (H13CN) | 431.660 GHz | 431.23 – 432.09 GHz |
| Carbon monosulphide (C34S) | 433.751 GHz | 433.32 – 434.19 GHz |
| Silicon monoxide (SiO) | 434.120 GHz | 433.69 – 434.55 GHz |
| Carbon monoxide (C18O) | 439.088 GHz | 438.65 – 439.53 GHz |
| Water vapor (H2O) | 439.151 GHz | 438.71 – 439.59 GHz |
| Carbon monoxide (13CO) | 440.765 GHz | 439.30 – 441.21 GHz |
| Carbon monosulphide (CS) | 440.803 GHz | 439.33 – 441.24 GHz |
| Hydrogen cyanide (HCN) | 443.123 GHz | 441.65 – 443.57 GHz |
| Lithium hydride (LiH) | 443.957 GHz | 443.51 – 444.40 GHz |
| Water vapor (H2O) | 448.001 GHz | 447.55 – 448.45 GHz |
| Hyrogen Sulphide (H2S) | 452.390 GHz | 451.94 – 452.84 GHz |
| Hydrogen isocyanide (HNC) | 453.270 GHz | 452.82 – 453.72 GHz |
| Carbon monoxide (CO) | 461.041 GHz | 459.50 – 461.50 GHz |
| Carbon monosulphide (13CS) | 462.331 GHz | 461.87 – 462.79 GHz |
| NH2 | 462.400 GHz | 461.94 – 462.86 GHz |
| Heavy water (HDO) | 464.925 GHz | 464.46 – 465.39 GHz |
| NH2 | 469.300 GHz | 468.83 – 469.77 GHz |
| Water vapor (H2O) | 474.689 GHz | 474.21 – 475.16 GHz |
| Silicon monoxide (SiO) | 477.503 GHz | 477.03 – 477.98 GHz |
| Heavy water (HDO) | 479.947 GHz | 479.47 – 480.43 GHz |
| Heavy water (HDO) | 481.780 GHz | 481.30 – 482.26 GHz |
| Carbon monosulphide (C34S) | 481.916 GHz | 481.43 – 482.40 GHz |
| Oxygen (O2) | 487.249 GHz | 486.76 – 487.74 GHz |
| Water vapor (H218O) | 489.054 GHz | 488.56 – 489.54 GHz |
| Carbon monosulphide (CS) | 489.751 GHz | 488.12 – 490.24 GHz |
| Heavy water (HDO) | 490.597 GHz | 490.11 – 491.09 GHz |
| Carbon (CI) | 492.162 GHz | 490.52 – 492.65 GHz |
| Carbon monosulphide (13CS) | 508.528 GHz | 508.02 – 509.04 GHz |
| Heavy water (HDO) | 509.292 GHz | 508.78 – 509.80 GHz |
| Hydrogen cyanide (H13CN) | 517.970 GHz | 517.45 – 518.49 GHz |
| Silicon monoxide (SiO) | 520.878 GHz | 520.36 – 521.40 GHz |
| Carbon monosulphide (C34S) | 530.071 GHz | 529.54 – 530.60 GHz |
| Hydrogen cyanide (HCN) | 531.716 GHz | 529.94 – 532.25 GHz |
| Methylidyne (CH) | 532.700 GHz | 532.17 – 533.23 GHz |
| SiH2 | 536.600 GHz | 536.06 – 537.14 GHz |
| Methylidyne (CH) | 536.800 GHz | 536.26 – 537.34 GHz |
| Carbon monosulphide (CS) | 538.689 GHz | 536.89 – 539.23 GHz |
| Hydrogen isocyanide (HNC) | 543.897 GHz | 543.35 – 544.44 GHz |
| Water vapor (H218O) | 547.676 GHz | 547.13 – 548.22 GHz |
| Carbon monoxide (13CO) | 550.926 GHz | 549.09 – 551.48 GHz |
| Carbon monosulphide (13CS) | 554.715 GHz | 554.16 – 555.27 GHz |
| Water vapor (H2O) | 556.936 GHz | 556.38 – 557.49 GHz |
| Silicon monoxide (SiO) | 564.244 GHz | 563.68 – 564.81 GHz |
| Ammonia (15NH3) | 572.113 GHz | 571.54 – 572.69 GHz |
| Ammonia (NH3) | 572.498 GHz | 571.93 – 573.07 GHz |
| SiH2 | 575.800 GHz | 575.22 – 576.38 GHz |
| Carbon monoxide (CO) | 576.268 GHz | 574.35 – 576.84 GHz |
| Carbon monosulphide (C34S) | 578.216 GHz | 577.64 – 578.79 GHz |
| Sodium Hydride (NaH) | 579.480 GHz | 578.90 – 580.06 GHz |
| Carbon monosulphide (CS) | 587.616 GHz | 587.03 – 588.20 GHz |
| Heavy water (HDO) | 599.927 GHz | 599.33 – 600.53 GHz |
| Carbon monosulphide (13CS) | 600.889 GHz | 600.29 – 601.49 GHz |
| Hydrogen cyanide (H13CN) | 604.268 GHz | 603.66 – 604.87 GHz |
| Silicon monoxide (SiO) | 607.599 GHz | 606.99 – 608.21 GHz |
| Hydrogen cyanide (HCN) | 620.304 GHz | 618.24 – 620.92 GHz |
| Water vapor (H2O) | 620.700 GHz | 620.08 – 621.32 GHz |
| Heavy water (HDO) | 622.483 GHz | 621.86 – 623.11 GHz |
| Silicon hydride (SiH) | 624.900 GHz | 624.27 – 625.53 GHz |
| Hydrogen chloride (HCl) | 625.040 GHz | 624.41 – 625.67 GHz |
| Hydrogen chloride (HCl) | 625.980 GHz | 625.35 – 626.61 GHz |
| Carbon monosulphide (C34S) | 626.349 GHz | 625.72 – 626.98 GHz |
| Silicon hydride (SiH) | 627.700 GHz | 627.07 – 628.33 GHz |
| Hydrogen isocyanide (HNC) | 634.510 GHz | 633.88 – 635.14 GHz |
| Carbon monosulphide (CS) | 636.532 GHz | 634.41 – 637.17 GHz |
| Carbon monosulphide (13CS) | 647.050 GHz | 646.40 – 647.70 GHz |
| H2D+ | 648.337 GHz | 647.69 – 648.99 GHz |
| Silicon monoxide (SiO) | 650.944 GHz | 650.29 – 651.60 GHz |
| Carbon monoxide (13CO) | 661.067 GHz | 658.86 – 661.73 GHz |
| Carbon monosulphide (C34S) | 674.470 GHz | 673.80 – 675.14 GHz |
| Carbon monosulphide (CS) | 685.435 GHz | 683.15 – 686.12 GHz |
| Magnesium hydride (MgH) | 687.100 GHz | 686.41 – 687.79 GHz |
| Magnesium hydride (MgH) | 687.900 GHz | 687.21 – 688.59 GHz |
| Hydrogen cyanide (H13CN) | 690.268 GHz | 689.58 – 690.96 GHz |
| Carbon monoxide (CO) | 691.473 GHz | 689.17 – 692.16 GHz |
| Carbon monosulphide (13CS) | 693.195 GHz | 692.50 – 693.89GHz |
| Silicon monoxide (SiO) | 694.275 GHz | 693.58 – 694.97 GHz |
| Hydrogen cyanide (HCN) | 708.877 GHz | 708.17 – 709.59 GHz |
| Oxygen (O2) | 715.393 GHz | 714.68 – 716.11 GHz |
| Carbon monosulphide (C34S) | 722.577 GHz | 721.85 – 723.30 GHz |
| Hydrogen isocyanide (HNC) | 725.107 GHz | 724.38 – 725.83 GHz |
| Carbon monosulphide (CS) | 734.324 GHz | 733.59 – 735.06 GHz |
| Silicon monoxide (SiO) | 737.594 GHz | 736.86 – 738.33 GHz |
| Carbon monosulphide (13CS) | 739.324 GHz | 738.58 – 740.06 GHz |
| Water vapor (H218O) | 745.320 GHz | 744.57 – 746.07 GHz |
| Water vapor (H2O) | 752.033 GHz | 751.28 – 752.79 GHz |
| Heavy water (HDO) | 753.411 GHz | 752.66 – 754.16 GHz |
| Carbon monosulphide (C34S) | 770.669 GHz | 769.90 – 771.44 GHz |
| Oxygen (O2) | 773.840 GHz | 773.07 – 774.61 GHz |
| Hydrogen cyanide (H13CN) | 776.819 GHz | 776.04 – 777.60 GHz |
| Silicon monoxide (SiO) | 780.594 GHz | 779.81 – 781.38 GHz |
| Carbon monosulphide (CS) | 783.199 GHz | 782.42 – 783.98 GHz |
| Carbon monosulphide (13CS) | 785.434 GHz | 784.65 – 786.22 GHz |
| Hydrogen cyanide (HCN) | 797.433 GHz | 794.77 – 798.23 GHz |
| Formylium (HCO+) | 802.653 GHz | 799.98 – 803.46 GHz |
| Carbon monoxide (CO) | 806.652 GHz | 803.96 – 807.46 GHz |
| Carbon (CI) | 809.350 GHz | 806.65 – 810.16 GHz |
| Hydrogen isocyanide (HNC) | 815.684 GHz | 812.96 – 816.50 GHz |
| Carbon monosulphide (C34S) | 818.745 GHz | 817.93 – 819.56 GHz |
| Silicon monoxide (SiO) | 824.186 GHz | 823.36 – 825.01 GHz |
| Carbon monosulphide (13CS) | 831.523 GHz | 830.69 – 832.36 GHz |
| Carbon monosulphide (CS) | 832.057 GHz | 829.28 – 832.89 GHz |
| Oxygen (O2) | 834.146 GHz | 833.31 – 834.98 GHz |
| Methylidinium (CH+) | 835.070 GHz | 834.23 – 835.91 GHz |
| Hydrogen cyanide (H13CN) | 863.069 GHz | 862.21 – 863.93 GHz |
| Carbon monosulphide (C34S) | 866.804 GHz | 865.94 – 867.67 GHz |
| Sulpher hydride (SH) | 866.900 GHz | 866.03 – 867.77 GHz |
| Silicon monoxide (SiO) | 867.457 GHz | 866.59 – 868.33 GHz |
| Sulpher hydride (SH) | 875.200 GHz | 874.32 – 876.08 GHz |
| Carbon monosulphide (13CS) | 877.591 GHz | 876.71 – 878.47 GHz |
| Carbon monosulphide (CS) | 880.899 GHz | 877.96 – 881.78 GHz |
| Carbon monoxide (13CO) | 881.273 GHz | 878.33 – 882.15 GHz |
| Hydrogen cyanide (HCN) | 885.977 GHz | 883.02 – 886.86 GHz |
| Lithium hydride (LiH) | 886.500 GHz | 885.61 – 887.39 GHz |
| Formilium (HCO+) | 891.558 GHz | 888.59 – 892.45 GHz |
| Heavy water (HDO) | 893.639 GHz | 892.74 – 894.53 GHz |
| Hydrogen isocyanide (HNC) | 906.239 GHz | 905.33 – 907.15 GHz |
| Silicon monoxide (SiO) | 910.710 GHz | 909.80 – 911.62 GHz |
| Carbon monosulphide (C34S) | 914.844 GHz | 913.93 – 915.76 GHz |
| Water vapor (H2O) | 916.172 GHz | 915.26 – 917.09 GHz |
| Heavy water (HDO) | 919.310 GHz | 918.39 – 920.23 GHz |
| Carbon monoxide (CO) | 921.800 GHz | 918.72 – 922.72 GHz |
| Carbon monosulphide (13CS) | 923.633 GHz | 922.71 – 924.56 GHz |
| Carbon monosulphide (CS) | 929.723 GHz | 926.62 – 930.65 GHz |
| Hydrogen cyanide (H13CN) | 949.299 GHz | 948.35 – 950.25 GHz |
| Silicon monoxide (SiO) | 953.943 GHz | 952.99 – 954.90 GHz |
| H3+ | 955.000 GHz | 954.04 – 955.96 GHz |
| Carbon monosulphide (C34S) | 962.865 GHz | 961.90 – 963.83 GHz |
| Carbon monosulphide (13CS) | 969.649 GHz | 968.68 – 970.62 GHz |
| Water vapor (H2O) | 970.315 GHz | 969.34 – 971.29 GHz |
| Nitrogen hydride (NH) | 974.479 GHz | 973.50 – 975.45 GHz |
| Hydrogen cyanide (HCN) | 974.488 GHz | 971.24 – 975.46 GHz |
| Carbon monosulphide (CS) | 978.529 GHz | 977.55 – 979.51 GHz |
| Formilium (HCO+) | 983.925 GHz | 980.64 – 984.91 GHz |
| Heavy water (HDO) | 984.138 GHz | 983.15 – 985.12 GHz |
| Hydronium (H3O+) | 984.697 GHz | 983.71 – 985.68 GHz |
| Water vapor (H2O) | 987.927 GHz | 986.94 – 988.92 GHz |
| Water vapor (H218O) | 994.634 GHz | 993.64 – 995.63 GHz |
| Heavy water (HDO) | 995.412 GHz | 994.42 – 996.41 GHz |
| Hydrogen isocyanide (HNC) | 996.771 GHz | 995.77 – 997.77 GHz |
| Silicon monoxide (SiO) | 997.155 GHz | 996.16 – 998.15 GHz |