Table 3
Selected transitions of isobutene ((CH3)2C=CH2) and propene (CH2=CHCH3) detected towards G+0.693, whose spectra are shown in Figs. 5 and 6, respectively.
| Species | Frequency (GHz) | Transition  |
log I (nm2 MHz) | log Aul (s−1) | gu | Eu (K) | Blending(a) |
|---|---|---|---|---|---|---|---|
| (CH3)2C=CH2 | 41.0488473 | 40,4 − 31,3(12) | −7.5883 | −7.1083 | 45 | 5.22 | CH313CH2OH |
| 41.0488473 | 40,4 − 31,3(11) | −7.4914 | −7.1083 | 36 | 5.22 | CH313CH2OH | |
| 41.0488769 | 40,4 − 31,3(01) | −6.9863 | −7.1083 | 144 | 5.22 | CH313CH2OH | |
| 41.0489065 | 40,4 − 31,3(00) | −7.2361 | −7.1082 | 81 | 5.22 | CH313CH2OH | |
| 41.0581587 | 41,4 − 30,3(11) | −7.7130 | −7.1080 | 36 | 5.22 | CH313CH2OH | |
| 41.0581587 | 41,4 − 30,3(12) | −7.5881 | −7.1079 | 27 | 5.22 | CH313CH2OH | |
| 41.0581894 | 41,4 − 30,3(01) | −6.9860 | −7.1079 | 144 | 5.22 | CH313CH2OH | |
| 41.0582201 | 41,4 − 30,3(00) | −7.3450 | −7.1079 | 63 | 5.22 | CH313CH2OH | |
| 77.9785914 | 80,8 − 71,7(12) | −6.7124 | −6.2134 | 85 | 17.54 | – | |
| 77.9785914 | 80,8 − 71,7(11) | −6.6155 | −6.2134 | 68 | 17.54 | – | |
| 77.9785915 | 81,8 − 70,7(11) | −6.8373 | −6.2133 | 51 | 17.54 | – | |
| 77.9785915 | 81,8 − 70,7(12) | −6.7124 | −6.2134 | 68 | 17.54 | – | |
| 77.9786193 | 80,8 − 71,7(01) | −6.1103 | −6.2133 | 272 | 17.54 | – | |
| 77.9786195 | 81,8 − 70,7(01) | −6.1103 | −6.2133 | 272 | 17.54 | – | |
| 77.9786473 | 80,8 − 71,7(00) | −6.3602 | −6.2133 | 153 | 17.54 | – | |
| 77.9786474 | 81,8 − 70,7(00) | −6.4694 | −6.2134 | 119 | 17.54 | – | |
| 87.2098252 | 90,9 − 81,8(11) | −6.6912 | −6.0612 | 57 | 21.72 | – | |
| 87.2098252 | 91,9 − 80,8(12) | −6.5662 | −6.0611 | 76 | 21.72 | – | |
| 87.2098252 | 90,9 − 81,8(12) | −6.5662 | −6.0611 | 95 | 21.72 | – | |
| 87.2098252 | 91,9 − 80,8(11) | −6.4693 | −6.0611 | 76 | 21.72 | – | |
| 87.2098526 | 91,9 − 80,8(01) | −5.9642 | −6.0612 | 304 | 21.72 | – | |
| 87.2098526 | 90,9 − 81,8(01) | −5.9642 | −6.0612 | 304 | 21.72 | – | |
| 87.2098801 | 90,9 − 81,8(00) | −6.3232 | −6.0612 | 133 | 21.72 | – | |
| 87.2098801 | 91,9 − 80,8(00) | −6.2140 | −6.0611 | 171 | 21.72 | – | |
| 94.4876421 | 82,6 − 73,5(12) | −6.6924 | −6.1025 | 85 | 23.07 | – | |
| 94.4876421 | 82,6 − 73,5(11) | −6.5955 | −6.1025 | 68 | 23.07 | – | |
| 94.4877915 | 82,6 − 73,5(01) | −6.0904 | −6.1026 | 272 | 23.07 | – | |
| 94.4879409 | 82,6 − 73,5(00) | −6.3402 | −6.1025 | 153 | 23.07 | – | |
| 94.4904265 | 83,6 − 72,5(11) | −6.8173 | −6.1025 | 51 | 23.07 | – | |
| 94.4904265 | 83,6 − 72,5(12) | −6.6924 | −6.1025 | 68 | 23.07 | – | |
| 94.4905764 | 83,6 − 72,5(01) | −6.0903 | −6.1025 | 272 | 23.07 | – | |
| 94.4907263 | 83,6 − 72,5(00) | −6.4494 | −6.1025 | 119 | 23.07 | – | |
| 95.4590035 | 91,8 − 82,7(11) | −6.6748 | −6.0010 | 57 | 25.09 | – | |
| 95.4590035 | 91,8 − 82,7(12) | −6.5499 | −6.0010 | 76 | 25.09 | – | |
| 95.4590057 | 92,8 − 81,7(12) | −6.5499 | −6.0010 | 95 | 25.09 | – | |
| 95.4590057 | 92,8 − 81,7(11) | −6.4530 | −6.0010 | 76 | 25.09 | – | |
| 95.4590922 | 91,8 − 82,7(01) | −5.9478 | −6.0010 | 304 | 25.09 | – | |
| 95.4590944 | 92,8 − 81,7(01) | −5.9478 | −6.0010 | 304 | 25.09 | – | |
| 95.4591808 | 91,8 − 82,7(00) | −6.3068 | −6.0009 | 133 | 25.09 | – | |
| 95.4591830 | 92,8 − 81,7(00) | −6.1977 | −6.0010 | 171 | 25.09 | – | |
| 96.4409266 | 101,10 − 90,9(11) | −6.5616 | −5.9249 | 105 | 26.35 | – | |
| 96.4409266 | 101,10 − 90,9(12) | −6.4366 | −5.9249 | 84 | 26.35 | – | |
| 96.4409266 | 100,10 − 91,9(12) | −6.4366 | −5.9249 | 63 | 26.35 | – | |
| 96.4409266 | 100,10 − 91,9(11) | −6.3397 | −5.9249 | 84 | 26.35 | – | |
| 96.4409536 | 101,10 − 90,9(01) | −5.8346 | −5.9249 | 336 | 26.35 | – | |
| 96.4409536 | 100,10 − 91,9(01) | −5.8346 | −5.9249 | 336 | 26.35 | – | |
| 96.4409805 | 101,10 − 90,9(00) | −6.1936 | −5.9249 | 189 | 26.35 | – | |
| 96.4409805 | 100,10 − 91,9(00) | −6.0844 | −5.9249 | 147 | 26.35 | – | |
| CH2=CHCH3 | 89.9972320 | 51,4 − 41,3(11) | −5.9650 | −6.3190 | 44 | 14.83 | – |
| 89.9981740 | 51,4 − 41,3(00) | −5.9650 | −6.3190 | 44 | 14.83 | – | |
| 103.6891170 | 60,6 − 50,5(11) | −5.7493 | −6.1109 | 52 | 17.50 | – | |
| 103.6900200 | 60,6 − 50,5(00) | −5.7493 | −6.1109 | 52 | 17.50 | – | |
| 156.4469910 | 92,8 − 82,7(11) | −5.2750 | −5.5851 | 76 | 44.78 | – | |
| 156.4475110 | 92,8 − 82,7(00) | −5.2750 | −5.5851 | 76 | 44.78 | – | |
Notes. We provide the transition frequencies, quantum numbers, base 10 logarithms of the integrated intensity at 300 K (log I), the base 10 logarithm of Einstein coefficients (log Aul), and upper state degeneracy (gu). We note that gu is calculated based on reduced spin weights by a factor of four. For isobutene, we have included all the hyperfine transitions that fall in the spectral ranges shown in Fig. 5. Some of them are weak and their contribution to the synthetic spectrum is negligible, but we have included them for completeness. (a)(σ1σ2) refers to the ERHAM labelling of internal rotor components (Groner 1997), where 00 = A1A1, 01 = EE, 11 = A1E, 12 = EA1.
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