Identification and intensities of the ``forbidden'' 3ν23 band of 12C16O2

Details Identification and intensities of the ``forbidden'' 3ν23 band of 12C16O2 Identification and intensities of the ``forbidden'' 3ν23 band of 12C16O2

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jmosp.112...18b&link_type=abstract

Journal of Molecular Spectroscopy, Volume 112, Issue 1, p. 18-25.

Physics

10

Scientific paper

Lines of the 3ν23 ``forbidden'' band of 12C16O2 have been identified in the 2000-cm-1 region of a long-path, 0.01-cm-1 resolution laboratory absorption spectrum. This band has detectable intensity due to Δl = 2 Fermi interactions between the upper level and the nearby ν1 + ν2 and 3ν21 levels. Intensities of 18 lines of this band have been measured using a nonlinear least-squares spectral fitting technique. The intensities are enhanced at high J and an expression for the intensity distribution as derived by Toth [Appl. Opt. 23, 1825-1834 (1984)] is used for the analysis. In terms of the total sample pressure, the vibrational band intensity is 0.194 +/- 0.008 × 10-30 cm-1/molecule-cm-2 at 296 K. The coefficient in the F factor is analogous to the Coriolis coefficient ξ and has been determined to be -0.0413 +/- 0.0015. As expected by theory, its value is very close to that of ξ for the related ν1 + ν2 band.

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