Absolute intensities for the Q-branch of the 4ν22←3ν23 (581.776 cm-1) band in carbon dioxide.

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Carbon Dioxide: Infrared Spectra

Scientific paper

Absolute intensity measurements in the Q-branch of the 4ν22ý3ν23 band of CO2 at 581.776 cm-1 have been performed using tunable diode laser spectroscopy. It was found that the values listed in the HITRAN (Rothman et al., 1992) database, which are calculated by direct numerical diagonalization, are 5% higher than those measured here. The vibrational band strength is 4.963(56)×10-3cm-2atm-1 at 296 K. A vanishing Hermann-Wallis coefficient is adequate to characterize this band up to J = 40.

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