Microwave Spectra of 13CH3C15N and 13CH3 13C 15N Molecules In the Frequency Range 17-95 GHz

Abstract

Some microwave frequencies of the v^ + Vg vibrational combination band for the two isotopes CH^C N and CH^ C N of methyl cyanide were measured in the frequency range 17-95 GHz, for the transitions AJ = 1<-0, AJ = 2<-1, AJ = 3<-2, AJ = 5<-4. Good agreement was found between experimental and theoretical values except for the components of quantum numbers k = l = ± 1 for each J. These components show a large departure between experimental and theoretical values, which attribute to two fermi resonances between v, and v^ + Vg, also between Vg and v^ + Vg vibrational states.