Table A.1
Selection of relevant transitions of H2CO, and CH3OH for cold environments in the (80–320 GHz) submm region.
| Transition | Frequency | log (intensity) | Aul | Eup | Upper state |
|---|---|---|---|---|---|
| at 300 K | degeneracy | ||||
( ) |
[MHz] | [nm2 MHz] | [s−1] | [K] | gup = gI ⋅ gk |
| H2CO (gI=1: para; gI=3: ortho) | |||||
| [132,11 − 132,12 | *89 565.0597 | −9.2706 | 9.299 × 10−7 | 368.668 | 27 = 1 ⋅ 27](a) |
| 21,2 − 11,1 | 140 839.5020 | −2.9775 | 5.301 × 10−5 | 21.9 | 15 = 3 ⋅ 5 |
| 20,2 − 10,1 | *145 602.9490 | −3.2841 | 7.809 × 10−5 | 10.5 | 5 = 1 ⋅ 5 |
| 21,1 − 11,0 | *150 498.3340 | −2.9206 | 6.468 × 10−5 | 22.6 | 15 = 3 ⋅ 5 |
| 31,3 − 21,2 | 211 211.4680 | −2.3879 | 2.270 × 10−4 | 32.1 | 21 = 3 ⋅ 7 |
| 30,3 − 20,2 | *218 222.1920 | −2.7693 | 2.816 × 10−4 | 21.0 | 7 = 1 ⋅ 7 |
| [32,2 − 22,1 | *218 475.6320 | −3.0917 | 1.570 × 10−4 | 68.1 | 7 = 1 ⋅ 7](a) |
| [32,1 − 22,0 | *218 760.0660 | −3.0906 | 1.576 × 10−4 | 68.1 | 7 = 1 ⋅ 7](a) |
| 31,2 − 21,1 | *225 697.7750 | −2.3318 | 2.770 × 10−4 | 33.5 | 21 = 3 ⋅ 7 |
| 41,4 − 31,3 | 281 526.9290 | −2.0074 | 5.879 × 10−4 | 45.6 | 27 = 3 ⋅ 9 |
| 40,4 − 30,3 | 290 623.4050 | −2.4132 | 6.897 × 10−4 | 34.9 | 9 = 1 ⋅ 9 |
| 41,3 − 31,2 | 300 836.6350 | −1.9524 | 7.175 × 10−4 | 47.9 | 27 = 3 ⋅ 9 |
CH3OH ((νt Parity)  ((νt’ Parity’) A & E1∕2 symmetry)(b) |
|||||
| (0+) 20,2 − 10,1 (0+) A | 96 741.371 | −4.9799 | 3.408 × 10−6 | 7.0 | 5 = 1 ⋅ 5 |
| (0) 20,2 − 10,1 (0) E1 | 96 744.545 | −4.9990 | 3.407 × 10−6 | 20.1 | 5 = 1 ⋅ 5 |
| (0+) 31,3 − 21,2 (0+) A | *143 865.795 | −4.5391 | 1.069 × 10−5 | 28.3 | 7 = 1 ⋅ 7 |
| (0) 30,3 − 20,2 (0) E1 | *145 093.754 | −4.4793 | 1.231 × 10−5 | 27.1 | 7 = 1 ⋅ 7 |
| (0) 3−1,3 − 2−1,2 (0) E2 | *145 097.435 | −4.5191 | 1.096 × 10−5 | 19.5 | 7 = 1 ⋅ 7 |
| (0+) 30,3 − 20,2 (0+) A | *145 103.185 | −4.4600 | 1.232 × 10−5 | 13.9 | 7 = 1 ⋅ 7 |
| (0−) 31,2 − 21,1 (0−) A | *146 368.328 | −4.5244 | 1.125 × 10−5 | 28.6 | 7 = 1 ⋅ 7 |
| [(0) 42,2 − 31,2 (0) E1 | *218 440.063 | −3.9915 | 4.686 × 10−5 | 45.5 | 9 = 1 ⋅ 9](a) |
| [(0) 80,8 − 71,6 (0) E1 | *220 078.561 | −4.0627 | 2.516 × 10−5 | 96.6 | 17 = 1 ⋅ 17](a) |
| [(0−) 81,7 − 80,8 (0+) A | *318 318.919 | −3.3698 | 1.793 × 10−4 | 98.8 | 17 = 1 ⋅ 17](a) |
Notes. All values are taken from the JPL catalog (Pickett et al. 1998) (entry: 30004 H2CO; 32003 CH3OH). Frequencies marked with an asterisk (*)are transitions that have been observationally investigated. gI is the spin-statistical weight and gk is the upper state spin-rotational degeneracy (2J+1). (a)Although these are weaker lines, they are relevant because they are part of this observation. (b) See Xu et at. (1997).
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