Near-Threshold Excitation of Metastable Helium by Electron Impact as Studied by the Time-of-Flight Method

Richard A. Heppner and Jens C. Zorn
Phys. Rev. Lett. 33, 1321 – Published 25 November 1974
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Abstract

A time-of-flight method is used to measure the distribution in speed and angle of the metastable atoms produced when ground-state helium atoms are excited by electron impact at near-threshold energies. The results are compared to predictions based on both theoretical and experimental determinations of the differential cross section, and it appears that there are significant discrepancies between the time-of-flight data and the predictions based on available theoretical cross-section calculations.

  • Received 12 August 1974

DOI:https://doi.org/10.1103/PhysRevLett.33.1321

©1974 American Physical Society

Authors & Affiliations

Richard A. Heppner* and Jens C. Zorn

  • Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48104

  • *Present address: Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards, Boulder, Colo. 80302.

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Issue

Vol. 33, Iss. 22 — 25 November 1974

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