Abstract
Abstract 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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