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The spectrum of CH3OH between 100 and 200 cm−1: Torsional and “forbidden” transitions

1990; Elsevier BV; Volume: 144; Issue: 1 Linguagem: Inglês

10.1016/0022-2852(90)90313-f

1096-083X

G. Moruzzi, P. Riminucci, F. Strumia, B. Carli, M. Carlotti, R. M. Lees, Indranath Mukhopadhyay, J. W. C. Johns, B.P. Winnewisser, Manfred Winnewisser,

Advanced Chemical Physics Studies

In the framework of a systematic investigation of the infrared and far infrared spectrum of CH3OH by high-resolution Fourier transform spectroscopy, we present a catalog of 6000 absorption lines between 100 and 200 cm−1 (which means practically all the measured lines in this region which are above a reasonable peakfinder threshold), and a list of 955 recently assigned lines below 100 cm−1, which had not been included in a previous paper. The Taylor expansion coefficients for evaluating the energies of the levels involved in the transitions are also given. Most of the lines occurring in the 100–200 cm−1 region involve torsionally excited states. Another interesting feature of this region is the presence of a forbidden Q branch (Δn = 1 and ΔK = 0 simultaneously). Two further forbidden Q branches, occurring at higher wavenumbers, are also presented.