Abstract
The J → J + 1 transitions ( J = 4, 5, 6, 7, 8) in the microwave spectra of methyl isocyanide and its 15N derivative have been obtained and analyzed in the 4 ν 8 degenerate vibrational state. Theoretical analytical expressions are given for the rotational frequencies in a 4 ν E state, separately for the l = 0, ±2, ±4 values. These formulas could only be used as a starting point for the assignment and analysis, because of the complexity of the spectrum and the number of accidental resonances appearing in many l = 0 and ±2 lines for low K values. A detailed analysis was obtained through a diagonalization of the energy matrix. Many types of A 1 A 2 doublings could be localized; in particular for CH 3 15NC the K, l = ±1, ±4 doubling allowed the calculation of the g 6 coefficient of the 〈 K, l| H|, l ± 6〉 term. As in the 3 ν 8 state, some lines seem to undergo the effects of a vibrational resonance. A set of constants is given for both species, and a comparison is made with the other states.
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