Analysis of the ν1 and ν2 + ν4 bands of 12CH4

Details Analysis of the ν1 and ν2 + ν4 bands of 12CH4 Analysis of the ν1 and ν2 + ν4 bands of 12CH4

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jmosp..93..317b&link_type=abstract

Journal of Molecular Spectroscopy, Volume 93, Issue 2, p. 317-350.

Physics

11

Scientific paper

Line assignments, positions, strengths, and experimentally determined upper states are reported for the ν1 and ν2 + ν4 infrared bands of 12CH4. The bands have been analyzed using infrared spectra recorded with different optical densities and temperatures at 0.02- and 0.01-cm-1 resolution using a four-passed grating spectrometer at Florida State University and a Fourier transform spectrometer at Kitt Peak National Observatory. Both ν1 and ν2 + ν4 lines are assigned through J' = 14. For J' >= 10, the upper state of the vibrationally infrared inactive ν1 band interacts strongly with ν2 + ν4 and is observed in the infrared spectrum with line strengths on the order of 10-3 cm-2 atm-1. The upper-state energies and transition intensities are calculated from the molecular constants and transition moment matrix elements obtained through a simultaneous analysis of ν1, ν3, ν2 + ν4, 2ν4, and 2ν2.

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