P-state-to-P-state transitions in optically prepared atomic collisions: I. Theory of measurement in terms of Stokes parameters

We present a parametrization in terms of Stokes parameters for the scattering from a P state to a P state for atomic collisions in a beam experiment. The classic approach to a 'complete scattering experiment', well known for S-state-to-P-state transitions, is generalized by a systematic combination of optical preparation of specific initial P states with Stokes parameter analysis of the radiation pattern from the final P state. The anisotropy of the initial and final state provides the possibility of extraction of a complete set of nine parameters describing the reaction at the level of five independent scattering amplitudes. We discuss the minimum number of experiments required to obtain a complete set of parameters in the cases of scattering angle-integrated and scattering angle-differential measurements. Relations to collision parameters for the reverse process are derived. Finally, effects due to fine and hyperfine depolarization, as well as inclusion of electron spin polarization, are treated.

Duke Scholars

Author Sonia Grego Electrical and Computer Engineering