Cross sections for electron-impact excitation out of metastable helium levels

8 May 1989

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 62 (19) , 2253-2256
https://doi.org/10.1103/physrevlett.62.2253

Abstract

Absolute apparent cross sections for electron-impact excitation out of the

2^{3}

S metastable level of He to the

3^{3}

4^{3}

3^{3}

3^{3}

4^{3}

5^{3}

D, and

6^{3}

D levels have been measured by a novel method. A beam of metastable atoms from a hollow-cathode discharge is crossed by an electron beam of energy from 3 to 16 eV, and the emission from the excited states is detected. Absolute calibration is made by measuring the ratio of electron excitation cross section to the known optical-absorption cross section and using knowledge of the pertinent branching ratios. Direct electron-impact excitation cross sections for the

3^{3}

3^{3}

S, and

3^{3}

D levels are obtained.

Keywords

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