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Table 3

Spectroscopic parameters of the CH3CN, CH3CCH, and CH3OCHO lines studied.

Transition J = v (MHz) Eu (K) Sµ2 (D2) log(Aij) (s−1)
CH3CN
54−44 91958.73 127.5 38.2 −4.8
53−43 91971.13 77.5 135.7 −4.6
52−42 91979.99 41.8 89.0 −4.4
51−41 91985.31 20.4 101.7 −4.4
50−40 91987.09 13.2 106.0 −4.4
54−44 91913.35 127.5 55.4 −4.6
53−43 91925.70 77.5 196.9 −4.4
52−42 91934.53 41.8 129.2 −4.3
51−41 91939.79 20.4 147.7 −4.2
50−40 91941.58 13.2 153.8 −4.2
CH3CN v8 = 1
51,3−4−1,3 92175.52 532.3 137.3 −4.2
54,2−44,2 92218.27 705.9 51.5 −4.7
53,2−43,2 92234.54 642.6 91.5 −4.4
52,2−42,2 92247.23 593.6 240.3 −4.3
54,3−44,3 92249.65 599.4 103.0 −4.7
51,2−41,2 92256.27 558.9 137.3 −4.2
53,3−43,3 92258.43 562.8 91.5 −4.4
50,2−40,2 92261.43 538.5 143.0 −4.2
52,3−42,3 92263.98 540.4 120.1 −4.3
5−1,3−41,3 92353.46 532.3 137.3 −4.2
CH3CCH
64−54 102516.57 132.4 55.4 −4.6
63−53 102530.35 82.0 196.9 −4.4
62−52 102540.14 46.0 129.2 −4.3
61−51 102546.02 24.4 147.7 −4.2
60−50 102547.98 17.2 153.8 −4.2
CH3OCHO
192,18−182,17 Ε 216109.78 109.3 49.4 −3.8
192,18−182,17 A 216115.57 109.3 49.4 −3.8
191,18−181,17 Ε 216210.91 109.3 49.4 −3.8
191,18−181,17 A 216216.54 109.3 49.4 −3.8
173,14−163,13 Ε 218280.90 99.7 43.6 −3.8
173,14−163,13 A 218297.89 99.7 43.6 −3.8

Notes. v is the frequency, Eu the upper state energy, Sµ2 the line strength, and Aij the Einstein coefficient for spontaneous emission.

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