A measurement of the P1 coherence parameter in forward scattering for excitation of the ns'(1/2)10 state in Ar and Ne by electron impact

K. E. Martus, K. Becker

Research output: Contribution to journalArticle

Abstract

The authors report measurements of the P1 coherence parameter for excitation of the spin-orbit coupled ns'(1/2)10(' 1P1') state of Ne (n=3) and Ar (n=4) by unpolarised electrons of intermediate energy (30-100 eV) which are subsequently scattered in the forward direction. The authors' experimental results verify the theoretical prediction of P1=+1 when angular resolution effects are properly taken into account. This result clarifies the previous discrepancy between experiment and theory and demonstrates unambiguously that the excitation process under these conditions proceeds via the direct excitation of the LS-coupled singlet contribution of the excited states, i.e. via transfer of orbital angular momentum.

Original languageEnglish (US)
Article number005
Pages (from-to)L497-L502
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume22
Issue number17
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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