RFM Isotopes

03OCT05
The following is a list of all the isotopomers recognised by the RFM. The table entries themselves are the commonly method of describing isotopes by the last digits of their atomic weights, eg the 'heavy hydrogen' version of H2O, 1H 16O 2H (actually the 4th most abundant isotope) is abbreviated to '162'.

ID Molecule Isotope Index
1 2 3 4 5 6 7 8 9
1 H2O 161 181 171 162 182 172
2 CO2 626 636 628 627 638 637 828 728 838 (Not Standard HITRAN)
3 O3 666 668 686 667 676
4 N2O 446 456 546 448 447
5 CO 26 36 28 27 38 37
6 CH4 211 311 212
7 O2 66 68 67
8 NO 30 31 32
9 SO2 626 646 628 636
10 NO2 46
11 NH3 4111 5111
12 HNO3 146
13 OH 61 81 62
14 HF 19
15 HCl 15 17
16 HBr 19 11
17 HI 17
18 ClO 56 76
19 OCS 622 624 632 623 822 634 (Not Standard HITRAN)
20 H2CO 126 136 128
21 HOCl 165 167
22 N2 44
23 HCN 124 134 125
24 CH3Cl 215 217
25 H2O2 1661
26 C2H2 1221 1231
27 C2H6 1221 1231 (Not Standard HITRAN)
28 PH3 1111
29 COF2 269
30 SF6 29
31 H2S 121 141 131
32 HCOOH 126
33 HO2 166
34 O 6
35 ClONO2 5646 7646
36 NO+ 46
37 HOBr 169 161
38 C2H4 221 231
39 HDO 162 (Not Standard HITRAN)
40 BrO 96 16 (Not Standard HITRAN)
41 C3H8 221 (Not Standard HITRAN)
42 C2N2 224 (Not Standard HITRAN)
43 C4H2 211 (Not Standard HITRAN)
44 HC3N 124 (Not Standard HITRAN)
45 C3H4 341 (Not Standard HITRAN)
46 GeH4 411 (Not Standard HITRAN)
Notes

  1. The RFM refers to each isotope by its HITRAN isotope index, as listed across the top of the table. These are in decreasing order of natural abundance.
  2. In Input files (inside .atm files, .gas files and entries in the driver table *GAS and *JAC sections) the isotopes is indicated by an entry in brackets following the molecule name, eg H2O(4) for isotope#4 of H2O
  3. In Output filenames, ie files created with isotopic Jacbians (JAC Flag), the isotope is indicated as an index following the character 'i' after the molecule name, eg h2oi4 for isotope#4 of H2O (this is different to the input because () characters in filenames can cause problems). The 'i' character itself is set by the PARAMETER CISO in subroutine jacnam.for).
  4. In HITRAN the line strengths are scaled by the abundance which is convenient since it means a single VMR can be specified for all isotopes together. (see the HITRAN Web-Page for assumed abundances).
  5. The RFM also includes isotopes and complete molecules which are not (currently) part of the standard HITRAN dataset. Since the intention is to maintain the entire HITRAN dataset nomenclature as a subset of the RFM some of these assignments may change if they become included in HITRAN.
  6. The actual table used by the RFM is contained in subroutine gasiso.for