Abstract
The line shift coefficients of the spectral line are of great interest for studying the intermolecular forces as well as for frequency calibration of reference spectral lines. In atmospheric optics, the shift coefficients are needed for improvement of the numerical calculation methods of laser radiation passing through the atmosphere and for increasing of the accuracy of small molecular species concentration determination in the atmosphere using lidar systems. Theoretical calculations of H 2 O absorption line shifts were carried out using a modified Anderson-Tsao-Curnutte-Frost method. The theoretical model was tested for various bands of water vapor. It proved to give accurate results both in fitting and interpolation for different bands in visible and infrared regions. The calculations of line shift coefficients use one fitting parameter (polarizability of the upper vibrational state) which is determined from experimental data.
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