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Atmospheric and Oceanic Optics

2021 year, number 2

Foreign-continuum absorption in the wings of the IR H2O bands

O.B. Rodimova, T.E. Klimeshina
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: water vapor continuum, water-nitrogen continuum absorption, spectral line wings, second virial coefficient


The H2O foreign-continuum absorption in the IR region is regarded according to the asymptotic line wing theory presenting absorption as a sum of the individual line absorption coefficients with a special line shape at far distances from the line center. The line shape parameters pertaining to quantum and classical Н2О-N2 interaction potentials are found as a result of fitting the experimental absorption data in the 4200-5000 cm-1 spectral interval and the data on the temperature dependence of the second virial coefficient. This line shape is used for calculation of the continuum absorption in the 1000-10000 cm-1 region.