Table 1
Spectroscopic properties of the observed methyl cyanide lines.
| Transition | Frequency | A ij | E up | g up | |
| J′ → J′′ | K | (GHz) | (s-1) | (K) | |
|
|
|||||
| 6–5 | 0 | 110.383500 | 1.11 × 10-4 | 18.5 | 26 |
| 6–5 | 1 | 110.381372 | 1.08 × 10-4 | 25.7 | 26 |
| 6–5 | 2 | 110.374989 | 9.88 × 10-5 | 47.1 | 26 |
| 6–5 | 3 | 110.364354 | 8.33 × 10-5 | 82.8 | 52 |
| 6–5 | 4 | 110.349470 | 6.17 × 10-5 | 132.8 | 26 |
| 6–5 | 5 | 110.330345 | 3.39 × 10-5 | 197.1 | 26 |
|
|
|||||
| 12–11 | 0 | 220.747261 | 9.24 × 10-4 | 68.9 | 50 |
| 12–11 | 1 | 220.743011 | 9.18 × 10-4 | 76.0 | 50 |
| 12–11 | 2 | 220.730261 | 8.99 × 10-4 | 97.4 | 50 |
| 12–11 | 3 | 220.709016 | 8.66 × 10-4 | 133.2 | 100 |
| 12–11 | 4 | 220.679287 | 8.21 × 10-4 | 183.1 | 50 |
| 12–11 | 5 | 220.641084 | 7.63 × 10-4 | 247.4 | 50 |
| 12–11 | 6 | 220.594423 | 6.92 × 10-4 | 325.9 | 100 |
| 12–11 | 7 | 220.539323 | 6.08 × 10-4 | 418.6 | 50 |
| 12–11 | 8 | 220.475807 | 5.12 × 10-4 | 525.6 | 50 |
| 12–11 | 9 | 220.403900 | 4.03 × 10-4 | 646.7 | 100 |
| 12–11 | 10 | 220.323631 | 2.81 × 10-4 | 782.0 | 50 |
|
|
|||||
| 13–12 | 0 | 239.137916 | 1.18 × 10-3 | 80.3 | 54 |
| 13–12 | 1 | 239.133313 | 1.17 × 10-3 | 87.5 | 54 |
| 13–12 | 2 | 239.119504 | 1.15 × 10-3 | 108.9 | 54 |
| 13–12 | 3 | 239.096497 | 1.12 × 10-3 | 144.6 | 108 |
| 13–12 | 4 | 239.064299 | 1.07 × 10-3 | 194.6 | 54 |
| 13–12 | 5 | 239.022924 | 1.00 × 10-3 | 258.9 | 54 |
| 13–12 | 6 | 238.972389 | 9.26 × 10-4 | 337.4 | 108 |
| 13–12 | 7 | 238.912715 | 8.35 × 10-4 | 430.1 | 54 |
| 13–12 | 8 | 238.843926 | 7.30 × 10-4 | 537.0 | 54 |
| 13–12 | 9 | 238.766049 | 6.11 × 10-4 | 658.2 | 108 |
| 13–12 | 10 | 238.679115 | 4.79 × 10-4 | 793.4 | 54 |
|
|
|||||
| 14–13 | 0 | 257.527383 | 1.48 × 10-3 | 92.7 | 58 |
| 14–13 | 1 | 257.522427 | 1.47 × 10-3 | 99.8 | 58 |
| 14–13 | 2 | 257.507561 | 1.45 × 10-3 | 121.3 | 58 |
| 14–13 | 3 | 257.482792 | 1.41 × 10-3 | 157.0 | 116 |
| 14–13 | 4 | 257.448128 | 1.35 × 10-3 | 207.0 | 58 |
| 14–13 | 5 | 257.403584 | 1.29 × 10-3 | 271.2 | 58 |
| 14–13 | 6 | 257.349179 | 1.20 × 10-3 | 349.7 | 116 |
| 14–13 | 7 | 257.284935 | 1.10 × 10-3 | 442.4 | 58 |
| 14–13 | 8 | 257.210877 | 9.90 × 10-4 | 549.4 | 58 |
| 14–13 | 9 | 257.127035 | 8.62 × 10-4 | 670.5 | 116 |
| 14–13 | 10 | 257.033444 | 7.19 × 10-4 | 805.8 | 58 |
Notes. Spectroscopic data taken from the Cologne Database for Molecular Spectroscopy (CDMS; Müller et al. 2005). Aij is the Einstein coefficient for spontaneous emission, Eup is the upper state energy, and gup is the upper state degeneracy.
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