Population Inversions Inferred from Intensity Measurements in Stationary Recombing He Plasma

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24 October 1977

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

Vol. 39 (17) , 1074-1077
https://doi.org/10.1103/physrevlett.39.1074

Abstract

Stationary population inversion between the low excited states of

{He}^{+}

has been observed in a helium plasma in contact with neutral helium. The ratio of population densities as deduced from Lyman line intensities is

\frac{n_{2}}{g_{2}} : \frac{n_{3}}{g_{3}} : \frac{n_{4}}{g_{4}} : \frac{n_{5}}{g_{5}} = 1 : 0.6 : 1.1 : 1.2

, where

\frac{n_{i}}{g_{i}}

is the population density with the principal quantum number

i

. The mechanism leading to the population inversion is discussed.

Keywords

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