The near-infrared spectrum of solid CH4

Details The near-infrared spectrum of solid CH4 The near-infrared spectrum of solid CH4

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jchph..96.7372c&link_type=abstract

Journal of Chemical Physics (ISSN 0021-9606), vol. 96, no. 10, May 15, 1992, p. 7372-7379.

Physics

Chemical Physics

13

Methane, Near Infrared Radiation, Solid Phases, Spectral Bands, Vibrational Spectra, Fourier Transformation, Harmonic Oscillation, Vibration Mode

Scientific paper

The IR absorption spectrum of CH4 from 4000 to 12,000/cm has been first studied in the solid phases I and II. More than 40 overtone and combination bands, up to the sixth order, have been observed. Some of them are weaker by a factor of about 100,000 than the IR fundamentals. The bands have been assigned on the basis of their frequency, structure and intensity. Features that can be attributed to propagating vibrons have been observed. The rotovibrational lines of molecules at O sub h sites of phase II have been resolved in a few bands, and their relative intensities are in excellent agreement with the predictions of the extended James and Keenan model. The results reported here may help to analyze more complicated spectra, as those of CH4 in planetary atmospheres.

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