CALCULATION OF THE RATE OF VIBRATIONAL-RELAXATION OF SF2 IN RARE-GASES WITHIN THE SUDDEN-PERTURBATION APPROXIMATION

The sudden-perturbation approximation is invoked to calculate effectiv e cross sections of vibrational-energy transfer and broadening of isol ated lines in spectra of symmetric-top molecules. Within the well-deve loped formalism of this approximation, linear and spherical molecules are treated as the limiting cases stemming from the general formula. T he theory is illustrated with numerical calculations of vibrational re laxation of SF6 in rare gases.