Abstract

Water vapor absorption coefficients are reported for nine HF laser wavelengths ranging from 3418.1600 cm⁻¹ to 3788.2253 cm⁻¹ for temperatures ranging from −18°C to 25°C. Pure water vapor as well as air-broadened (N₂/O₂) water vapor absorptions were measured at pressures from less than 1–764 Torr with some of the air-broadened data being used to extract effective self-to-foreign-broadening parameters in the vicinity of the laser frequencies. Limited data were also collected on O₂-broadened water vapor absorption as well as pure and air-broadened CO₂ absorption. The CO₂ data agree reasonably well with theoretical predictions; but the air- and O₂-broadened water vapor data show greater absorption than theoretically predicted and seem to imply a super Lorentz/Voigt line shape for H₂O.

© 1979 Optical Society of America

Pressure dependence of the water vapor continuum absorption in the 3.5–4.0-μm region

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