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

Spectrally resolved measurements of water vapor absorption spectra near 1.4 mu m have been performed with a tunable, distributed-feedback lnGaAsP diode laser. A lineshape analysis was used to infer the collision-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 coefficients was determined using a temperature-controlled static cell and a pressure-driven shock tube over the range 300-1200 K. The measured coefficients 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 our results. (C) 1994 Academic Press, Inc.