On the collisional transfer of nonequilibrium in the velocity distributionof resonant particles in a laser radiation field

The collisional transfer of nonequilibrium in the velocity distribution of resonant particles in a laser radiation field is investigated theoretically . It is shown numerically that the transfer effect is weak. This makes it p ossible to use simpler approximate one-dimensional quantum kinetic equation s instead of three-dimensional equations to solve spectroscopy and light-in duced gas kinetics problems, where it is important to take account of the v elocity dependence of the collision frequency. It is shown for anomalous li ght-induced drift, calculations of which are most sensitive to neglecting t he transfer effect, that in a wide range of spectroscopy and light-induced gas kinetics problems the transfer of nonequilibrium can be neglected witho ut risking the loss of important fine details of the phenomena being descri bed. (C) 2000 MAIK "Nauka/Interperiodica".