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Fig. 2

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Section of the millimeter-wave spectrum of n-C4H9CN displaying features caused by all three conformers investigated in the present analysis. The quantum numbers for the J = 38−37 transitions of the AA conformer are given in blue (the Kc quantum numbers have been omitted because the asymmetry splitting was not resolved for these transitions). Transitions of the GA and AG conformers have been marked with triangles pointing upward (green) and downward (red), respectively. Triangles in parentheses are used for overlapped lines or lines with bad line shape. The AG lines have J = 34−33, and Ka = 27, 4, and 28 from left to right; Kc = J − Ka + 1 for the Ka = 4 line. The GA lines belong to b-type Q-branch transitions with quantum numbers JKa,Kc = 409,31−408,32, 697,62−696,63, and 9511,84−9510,85 from left to right. The lines are presented as second derivatives of a Gaussian line shape because of the 2f-modulation.

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