Identification and intensities of the “forbidden” 3ν23 band of 12C16O2 |
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Authors: | DChris Benner Curtis P Rinsland |
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Institution: | Department of Physics, College of William and Mary, Williamsburg, Virginia 23185 USA;NASA Langley Research Center, Atmospheric Sciences Division, Hampton, Virginia 23665 USA |
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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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