Abstract
Infrared spectra of gaseous and matrix isolated trans-CH 3N:CHCH 3, CD 3N:CHCH 3 and CH N:CDCD 3 have been recorded from 4000 to 200 cm −1 under medium resolution. Nearly complete assignments have been established based upon rotational contours, isotope shifts and group frequency correlations. A number of Fermi resonances have been detected mainly related to CH(D) stretching fundamentals. ln particular, the light N-methyl group gives rise to a complicated Fermi multiplet in the CH-stretching region. An examination of Q sub-band structures resulted in the identification of a number of Coriolis resonances, which in most cases involve pairs of nearly coinciding ‘E-type“ methyl deformation fundamentals. The rotational fine structure of three bands has been analysed by means of combination differences providing estimates for effective rotational constants A( u)- 1 2 [ B( u)+ C( u)]. From a normal coordinate analy a 30 parameter valence force field has been obtained, which allows an approximation of 85 experimental frequencies with an RMS deviation of 7.4 cm −1.
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