Partial cross sections for excitation of He(3{sup 1}{ital D}) states by electron impact
- Physics Department, The University of Western Australia, Nedlands, Perth 6907 (Australia)
We report absolute measurements of a rank four state multipole for He(3{sup 1}{ital D}) excitation by electron impact with a polarized first-photon{endash}second-photon coincidence technique. The presented technique permits the extraction of total (scattering angle integrated) partial cross sections {sigma}{sub {ital m}} for the excitation of He(3{sup 1}{ital D}{sub {ital m}}) magnetic substates ({ital m}=0,{plus_minus}1,{plus_minus}2). The present results stringently test existing theories and, for example, indicate that most theoretical calculations underestimate the partial cross sections {sigma}{sub 0} and {sigma}{sub 1} and overestimate the {sigma}{sub 2}. The recent convergent close-coupling calculations of Fursa and Bray [Phys. Rev. A {bold 52}, 1279 (1995)] are in excellent agreement with all our measured data. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 283854
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 53; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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