Time reversal symmetry of exact differential scattering amplitudes for atom–diatom collisions is considered in detail. New stronger symmetries are derived for the amplitude in which the quantization axes for the initial and final rotor states are arbitrary. The general time reversal symmetry relation is then specialized to treat the initial–initial, final–final, ? and ?-helicities and Basel convention amplitudes. A new exact selection rule for Basel amplitudes is obtained. Our results are of importance for a general understanding of magnetic transitions in atom–diatom collisions and also for understanding the CS and IOS approximations for magnetic transitions.
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Khare et al. (1980) studied this question.