Abstract
We present linear and circular polarization measurements of 31P-- 21S (501.6 nm) photons detected in delayed coincidence with electrons inelastically scattered from the 31P level of helium. Vector polarization and coherence parameters of the coincident radiation provide direct experimental evidence of the coherent nature of the excitation process. Atomic orientation is obtained directly from the circular polarization measurements. Analysis of the data also yields lambda and chi parameters for 31P excitations, which are compared with previous data and theory.
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