TEMPERATURE-DEPENDENT COLLISION-BROADENING PARAMETERS OF H2O LINES INTHE 1.4-MU-M REGION USING DIODE-LASER ABSORPTION-SPECTROSCOPY

Spectrally resolved measurements of water vapor absorption spectra nea r 1.4 mu m have been performed with a tunable, distributed-feedback ln GaAsP diode laser. A lineshape analysis was used to infer the collisio n-broadening coefficient of 11 rovibrational transitions in the nu(1) + nu(3) and 2 nu(I) vibration bands perturbed separately by N-2, O-2, CO2, and H-2. The temperature dependence of the broadening coefficient s was determined using a temperature-controlled static cell and a pres sure-driven shock tube over the range 300-1200 K. The measured coeffic ients are in good agreement with the previous calculations of Delaye. Also, agreement is found between prior experimental data, obtained for the same rotational transitions but different vibration bands, and ou r results. (C) 1994 Academic Press, Inc.