Phys. Rev. A 64, 032704 (2001) [4 pages]

Measurement of absolute differential cross sections for the excitation of atomic hydrogen to its n=3 and 4 levels by electron impact

Abstract

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Christopher J. Sweeney^*, Alan Grafe^*,†, and Tong W. Shyn^‡
Space Physics Research Laboratory, University of Michigan Ann Arbor, Michigan 48109-2143

Received 29 January 2001; revised 19 March 2001; published 2 August 2001

Using a modulated crossed-beam method, we have measured absolute differential cross sections for the excitation of atomic hydrogen to its n=3 (3²S+3²P+3²D) and 4(4²S+4²P+4²D+4²F) levels by electron impact. A wide range of scattering angles was covered, while the impact energies employed were 20 and 30 eV. Absolute integrated excitation cross sections were calculated from the differential ones. Our results are compared with those of others.

URL:

http://link.aps.org/doi/10.1103/PhysRevA.64.032704

DOI:

10.1103/PhysRevA.64.032704

PACS:

34.80.Dp

^*Also at the Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120. Electronic address: sweeney@engin.umich.edu

^†Present address: Department of Computer Science, Engineering Science, and Physics, University of Michigan–Flint, Flint, MI 48502-1950.

^‡Electronic address: shyna@umich.edu

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Phys. Rev. A 64, 032704 (2001) [4 pages]

Measurement of absolute differential cross sections for the excitation of atomic hydrogen to its n=3 and 4 levels by electron impact