Excitation and decay study up to high pressures of the 33P level of helium pumped by an intense relativistic electron beam

1 April 1980

journal article
research article
Published by AIP Publishing in Journal of Applied Physics

Vol. 51 (4) , 1900-1904
https://doi.org/10.1063/1.327901

Abstract

We studied the pressure‐dependent peak intensity and time history of the 388.9‐nm radiation emitted from the 3³P→2³S transition of helium at pressures ranging from 10⁻² to 55 Torr, following excitation with a short (15 nsec) and intense (25 kA) burst of high‐energy (500 keV) electrons. From the decay of radiation we determined the short‐lived and long‐lived decay components and the values of the effective direct‐excitation cross section of the 3³P level at several gas pressures. At low pressures ( p?4 Torr) we also determined the quenching cross section of the 3³P level by ground‐state helium collisions.

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