Estimation of H2O absorption lines contribution to the atmospheric transmission in ultraviolet spectral region
A.V. Chentsov1, T.Yu. Chesnokova1, B.A. Voronin1, S.N. Yurchenko2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Department of Physics and Astronomy, University College London, London, UK
Keywords: water vapor, ultraviolet region, atmospheric transmission, absorption lines
Abstract
At present, the most complete theoretical list of H2O monomer absorption lines is the POKAZATEL data bank, which contains H2O lines up to energy dissociation ~ 40000 cm-1 (0.25 mm). The atmospheric transmission of ultraviolet (UV) radiation is simulated with use of H2O lines from the POKAZATEL. The broadening parameters of the absorption lines are defined more accurately with use of different approximations in the UV region. It is shown that the H2O absorption lines contribution to the atmospheric transmission can reach 0.03 near 25000 cm-1 at a spectral resolution of 0.01 cm-1.
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