Diode-laser measurements of temperature-dependent half-widths of H2O transitions in the 1.4 μm region.

Physics

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Water Vapor: Laboratory Spectra, Water Vapor: Infrared Spectra, Water Vapor: Line Profiles

Scientific paper

Two distributed-feedback InGaAsP diode lasers have been used to perform spectrally resolved measurements of H2O transitions near 1.4 μm. Line-shape analyses of the recorded absorption spectra yielded the temperature-dependent self-, N2-, and CO2-broadened half-widths. Room-temperature (296 K) half-widths for eight rovibrational transitions in the ν1+ν3 and 2ν1 vibrational bands were determined from measurements recorded in a variable pathlength (0.4-10 m) multi-pass cell. The temperature dependence of the half-widths for four of the transitions were determined from measurements conducted in a heated static cell over a temperature range of 400-1000 K. The room-temperature half-widths and temperature exponents were determined to an average accuracy of +8%/-6% and ±9%, respectively, and are in good agreement with theoretical calculations and published half-widths for transitions with the same rotational quantum numbers.

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