Review of advances in describing the 31D-state excitation of helium

J. F. Williams*, A. G. Mikosza, J. B. Wang

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review


Recent advances in describing the electron impact excitation of the 31D state of helium are reported for an incident energy of 40 eV and scattering angles from 10° to 40°. Measurements of the Stokes parameters have been made using the polarized photon-photon and electron-photon coincidence techniques. The partial cross section σm for the magnetic sublevels in the collision frame indicate that the m = 0 excitation is favoured. For the above scattering kinematics the data are in agreement with convergent close coupling calculations. The deduced scattering amplitudes, in the natural frame, show that the m = 2 excitation becomes dominant at the larger angles. Progress is reported on the complete determination of the scattering amplitudes and their relative phases using the triple-coincident detection of the scattered electron with the two sequential cascading photons.

Original languageEnglish
Pages (from-to)906-913
Number of pages8
JournalCanadian journal of physics
Issue number11-12
Publication statusPublished - Nov 1996
Externally publishedYes


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