Fig. 4

Section of the rotational spectrum of n-PrCN displaying the clustering of a-type R-branch transitions of the anti conformer with higher values of Ka. Magenta asterisks indicate transitions of ν30 = 1, green circles those of ν18 = 1, a black circle a transition of ν30 = 2, “a0” labels a ground state transition, and a “g” labels transitions of the gauche conformer.
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