Abstract
Electron impact excitation of the 3 1D state of helium hasbeen studied using the scattered electron-polarized photoncorrelation method. Results are presented at incident electronenergies of 26.5, 29.6, 40.0, 45.0 and 60.0 eV for scatteringangles up to 40°. The data presented here complement theprevious large angle data from this laboratory and takentogether provide a complete mapping of the dimensionlessparameters characterizing excitation of the 3 1D state ofhelium over a wide range of both angle and energy. Strongvariations in the parameters as a function of energy and angleare discussed. Good agreement is observed between theexperimental data and recent theoretical predictions.
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