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VOLUME 38 | ISSUE 7 | PAGE 349
Vibrational relaxation rate of SF6 molecules excited in an intense IR laser field
The characteristic times and collision cross sections have been measured for the resonant intramode (the v3 mode) vv exchange and the nonresonant intermode vv' exchange of vibrational energy in SF6 molecules vibrationally excited in an IR laser field. The measurements were taken by coherent anti-Stokes Raman spectroscopy. The cross section for the resonant vv exchange is considerably larger than the cross section for gas kinetic collisions and increases linearly with the vibrational excitation level of the molecules.