Far infrared LMR spectra of monobromomethyl radicals

Abstract

Far infrared laser magnetic resonance spectra of the monobromomethyl radicals, CH 2Br and CD 2Br, in the gas phase have been observed at twelve wavelengths between 336 and 1224 μm. The assignment of the spectra to CH 2Br and CD 2Br is based on chemical tests and identification of the rotational transitions involved. Identical spectra have been obtained from two different sources, the reactions of F atoms with CH 3Br (CD 3Br) and of Na atoms with CH 2Br 2 (CD 2Br 2). Although most of the spectra are congested and irregular and do not permit a complete assignment to be made, an analysis based on a planar C 2v structure and symmetric top model yields B+ C=0.744(8) and 0.621(15) cm −1 for CH 2Br and CD 2Br, respectively.