Determination of Coefficients of Water Vapor Absorption Line Center Shifting by Nitrogen and Oxygen Pressure in the Visible Range

Abstract

An analytical model δ(sur) is suggested for calculating shift coefficients δ of water vapor lines by pressure of nitrogen and oxygen in the visible range. The model depends on fitting parameters and linearly depends on the line broadening coefficient. The model δ(sur) retrieves 496 coefficients δ for lines from the range 13 550–22 590 cm⁻¹ with a mean square deviation of 6.0 × 10⁻³ cm⁻¹/atm in the case of line center shifts by nitrogen and 265 coefficients δ for lines from the range 13 550–14 000 cm⁻¹ with a mean square deviation of 2.5 × 10⁻³ cm⁻¹/atm in the case of line center shifts by oxygen. The model can be used for calculating coefficients of broadening and shift of H₂O absorption lines by pressure of nitrogen, oxygen, and air in the visible range.