Abstract
High-resolution stimulated inverse Raman spectroscopy has been applied to the study of collisional broadening, shifting, and line mixing for theOO(J,N= 5) triplet line of the fundamental vibrational band of molecular oxygen. Accurate line broadening coefficients for the individualJcomponents within the triplet have been measured for the first time and show a significantJdependence. The line broadening coefficients are larger than those previously obtained for unresolved pure rotational Raman lines. The additional broadening is expected to result from electronic spin relaxation. The pressure-induced line shift has been obtained for this line and compared to the value obtained for the fundamentalQbranch. By applying the Rosenkranz perturbation treatment to the collisionally mixed components of the triplet line, we have been able to obtain an estimate of the coupling parameters.
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