Quantum and classical mechanical calculations of transport-relaxation cross sections for the HD-He interaction

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Abstract
Explicit identification of the quantum mechanical energy dependent effective cross sections with their classical counterparts is made. Detailed quantal and classical trajectory computations of these cross sections are then carried out for the interaction between HD and He; excellent agreement between the two calculations is obtained at high energies although, as expected, the agreement deteriorates at lower energies. A hybrid scheme which employs classical results at high and quantal results at low energies proves to be an accurate and practical method for studying the temperature dependence of macroscopic cross sections.