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Fig. 1


Section of the submillimeter spectrum of CH3CN. Transitions of 13CH3CN (J = 36−35) and CHCN (J = 35−34) in their ν8 = 1 excited vibrational states were labeled with their k quantum numbers. Spin-statistics cause k = −2, 5, and 7 to appear stronger than expected, 1 indicates the A2 component of the asymmetry-like split k = + 1 transition, see Sect. 3 for further details. The clipped lines are the J = 35−34k = −8 and k = 10 transitions of the main isotopolog in ν8 = 1. The latter line is overlapping the A1 component of the k = + 1J = 36−35 line of CH3C15N, ν8 = 1. The lines appear similar to second derivatives of a Gaussian line-shape because of the 2f-modulation.

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