Physics – Chemical Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jchph..80.1367f&link_type=abstract
Journal of Chemical Physics (ISSN 0021-9606), vol. 80, Feb. 1, 1984, p. 1367, 1368. NASA-supported research.
Physics
Chemical Physics
23
Gas Spectroscopy, Infrared Spectra, Methane, Pressure Broadening, Spectral Line Width, Electron Transitions, Gamma Ray Spectra
Scientific paper
Experimental results for the pressure-broadened linewidths gamma of methane are presented and compared with theoretical results. A solar Fourier transform spectrometer with spectral resolving power of about one million was used together with a 6-m base length multitraversal absorption cell. Pressures were determined to an accuracy of + or - 0.2 Torr by means of a capacitance manometer. The pressuring gases were N2, H2, and He. Results are presented for numerical averages of all linewidths corresponding to a given tetrahedral symmetry for J = 0-6. For all cases studied, gamma(E) is found to be substantially less than gamma(A), and gamma(A) is found to be near to, but significantly smaller than, gamma(F). Relative inelastic cross sections calculated for argon scattering from methane are compared with relative pressure-broadened linewidths measured in several experiments involving methane and other gases.
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