THE SPECTRUM OF CH3OH BETWEEN 100 AND 200 CM-1 - TORSIONAL AND FORBIDDEN TRANSITIONS

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. © 1990.