Vol. 1, issue 01, article # 4

Bykov A. D., Korotchenko E. A., Makushkin Yu. S., Ponomarev Yu. N., Sinitsa L. N., Solodov A. M., Stroinova V. N., Tikhomirov B. A. The investigation of the water vapour line shifts by air pressure.. // Atmospheric and oceanic optics. 1988. V. 1. No. 01. P. 40-45.
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The water vapour line shift coefficients by air pressure have been measured for nine lines. The measurements have been carried out in 0,69 mm range by two-channel optoacoustic spectrometer with ruby laser and in 1,06 mm range by spectrophotometer with Nd : glass laser. The accuracy of the line shift measurements was 0,003 cm-1. The line shift coefficient calculations have been carried out by Anderson - Tsao - Curnutte method for measured lines. The fitting parameter is H2O molecule polarizability in the upper vibrational state. The calculated results have a good agreement with the experimental data. Measurements and calculations have been shown that all line shifts for the lands ν1 + 3ν3, ν2 + 2ν3 were occured to the red range. The values of the line shifts can be about 0,034 cm-1 for normal pressure and temperature. The collisions with O2 molecules significantly contributes to the line shift coefficient.