Abstract
We report on the successful extended analysis of the high-frequency (200–700GHz) part of the gas phase (sub)mm-wave spectra of dimethylsulfoxide (DMSO). The spectrum was recorded at 100kHz resolution using a solid state subTHz spectrometer. The five lowest energy fundamental vibrational states of DMSO with frequencies below 400cm−1 were observed as sidebands along with the main 0←0 band. Neglecting the internal rotation of methyls, our rotational Hamiltonian reproduced the spectrum to the subMHz accuracy. We have found that the asymmetric bending state ν23 is the only low frequency fundamental vibrational state with the “anomalous” rotational structure uncovered in Cuisset et al. [1]. dmsomw 2013-09-04 15:03 © 2013 Elsevier
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