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Proceedings Paper

Far Infrared (FIR) And Infrared (IR) Spectroscopy Of Methanol Applied To FIR Laser Assignments
Author(s): R M Lees
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Paper Abstract

High-resolution Fourier transform spectra of methyl alcohol have been investigated in the FIR and IR regions from 40-300 cm and 950-1100 cm-1, respectively. A principal aim was to confirm and extend identifications of transitions contributing to the rich FIR laser emission known to be obtained by optically pumping methanol vapour with CO2 lasers. The general structures of the energy levels and spectra are discussed, and results and analysis are presented for the normal isotopic species as well as the C-13 and 0-18 isotopic forms. The technique of forming closed frequency combination loops is described, with application to the rigorous confirmation of transition assignments and improvement of frequency accuracies of reported FIR laser lines. Also outlined are some recent novel assignments of high-frequency TEA-laser-pumped FIR laser lines as torsional refilling transitions within the vibrational ground state.

Paper Details

Date Published: 26 September 1986
PDF: 13 pages
Proc. SPIE 0666, Far-Infrared Science and Technology, (26 September 1986); doi: 10.1117/12.938831
Show Author Affiliations
R M Lees, University of New Brunswick (Canada)


Published in SPIE Proceedings Vol. 0666:
Far-Infrared Science and Technology
Jerald A. R. Izatt, Editor(s)

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