Abstract
Measurements of the relative magnetic-substate population of differentially scattered H(2p) atoms formed in 4-, 5-, and 8-keV proton-helium collisions have been made using polarized-photon--scattered-particle coincidence techniques. The relative phases of the scattering amplitudes were also determined. It was found that the differential cross sections for the magnetic substates ${m}_{l}$=0 and ${m}_{l}$=\ifmmode\pm\else\textpm\fi{}1 were of comparable magnitude indicating that translational and rotational coupling play equally important roles in the excitation process. The average measured phase difference was found to be \ensuremath{\Vert}45?(de\ensuremath{\Vert}.
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