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Phys. Rev. A 59, 4079–4082 (1999)

Electron-impact-excitation cross sections out of the 23S metastable level of helium at high energies

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John B. Boffard, Mark E. Lagus, L. W. Anderson, and Chun C. Lin
Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706

Received 8 December 1998; published in the issue dated May 1999

In this paper we report experimental measurements of the electron-impact-excitation cross sections out of the 23S metastable level of helium into higher excited levels, with emphasis on measurements at high electron energies. The agreement between our metastable results and recent theoretical calculations is comparable to the agreement between experimental and theoretical values for excitation from the ground state.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.59.4079
DOI:
10.1103/PhysRevA.59.4079
PACS:
34.80.Dp, 34.80.My