Vol. 1, issue 01, article # 4
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Abstract:
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.