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 article


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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    Williams, J. F., Mikosza, A. G., & Wang, J. B. (1996). Review of advances in describing the 31D-state excitation of helium. Canadian journal of physics, 74(11-12), 906-913.