The Fourier transform infrared spectrum of methyleneimine in the 10 mgr;m region

摘要

The infrared spectrum of methyleneimine, CH2NH, has been observed in the gas phase with a resolution of 0.0048 cmminus;1using the National Optical Observatory solar Fourier transform spectrometer. The CH2NH was produced by the pyrolysis of CH3NH2at sim;1000thinsp;deg;C. Vibrational band origins and rotational constants have been determined for the ngr;7, ngr;8, and ngr;9bands. These were analyzed as a set of three states strongly coupled by Coriolis interaction. More than 2500 transitions were assigned, of which many are lsquo;lsquo;forbiddenrsquo;rsquo; transitions, such asqQbranches, induced in the ngr;9band by the strong Coriolis interaction between ngr;7and ngr;9. Owing to the high precision of the data, and the highJvalues of many of the observed transitions, it was necessary to include many of the high order interaction constants in order to achieve a quantitative fit.