Relaxation parameters for power-broadened microwave line shapes. I. Anderson theory

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Abstract
A model is developed for the calculation of collisional cross sections for all spherical tensor orders. The model is based on the Anderson low-power linewidth theory. General expressions are derived for the cross sections and then evaluated for the case of multipole–multipole interaction potentials. Motivated by application to power-broadened microwave line shapes, the dependence of the cross sections on tensor order is discussed. It is shown that for the typically dominant case of dipole–dipole potentials, many of the cross sections are independent of tensor order. The order dependence for other potentials is discussed.