COMPARISON OF CLASSICAL TRAJECTORY AND QUANTAL CLOSE-COUPLING CALCULATION OF GENERALIZED CROSS-SECTIONS FOR N-2(-HE MIXTURES())

Quantal close-coupling calculations of the energy-dependent cross sect ions governing relaxation phenomena in depolarized Rayleigh scattering and nuclear magnetic resonance, and the Senftleben-Beenakker effect o n viscosity, diffusion, and thermal conductivity have been performed f or the system N-2(+)-He. The corresponding classical expressions for t hese cross sections have been evaluated by the classical trajectory me thod and compared with the quantal results in the energy range 50 cm(- 1) to 838.6 cm(-1). Excellent agreement is found for all 16 cross sect ions at the highest energy studied. While the agreement deteriorates f or most of the cross sections at lower energies, the quantization erro rs for the field-free viscosity and diffusion cross sections, which ha ve non-vanishing spherical limits, are within 3% for all energies cons idered.