Knowledge Bank

Self-broadening parameters have been extracted for selected transitions in the $\nu 1,2\nu 2$ and $\nu 3$ bands of water vapor observed between $2500-4200cm-1$. The $H2O$ spectrum at room temperature in natural isotopic abundance has been recorded in this region at pressure-broadening-limited resolution with a Bruker FTS 120HR and a White-type cell adjusted to provide pathlengths of 64.5-288.5m. Sample pressures used were 0.007-29.7mbar (0.005-22.3 Torr). Broadening coefficients determined for transitions in the $\nu 2$ band of water vapor in this study and earlier $worksa$ are comparable. The results of the broadening determinations are presented and discussed.