Abstract

The Q-branch linewidths of hydrogen fluoride were measured by using coherent anti-Stokes Raman spectroscopy (CARS). The first seven transitions were excited by a broadband CARS system, and low-resolution spectra were recorded on an optical multichannel analyzer at pressures from 50 to 700 Torr in 50-Torr increments. A nonlinear least-squares program was employed to fit calculated spectra to experimental spectra by adjusting the linewidths. All lines displayed pressure broadening over the pressure region investigated, with relative magnitudes being consistent with theory and available infrared data. Although the Q-branch lines of the observed spectra were partially blended, the CARS data and calculations permitted consistent linewidth measurements over the pressure range of the experiment.

© 1984 Optical Society of America

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