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Population inversion in a discharge plasma with neck-type instabilities

K. N. Koshelev^a, H.-I. Kuntse<sup>b

a</sup> Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
^b Institut fur Experimentalphysik V, Ruhr-Universität Bochum, Germany

Abstract: An analysis is made of the feasibility of using strong plasma outflow from focus-type constrictions of an axial-discharge plasma column. Selective ion recombination as a result of charge transfer with ions carrying a smaller charge in the main plasma column or with neutral atoms in the residual gas in the discharge chamber can create a population inversion for transitions in the soft x-ray and VUV parts of the spectrum. General problems encountered in the investigated system are discussed and quantitative estimates are obtained of the population inversion of levels participating in the 4 → 3 transitions in Li-like oxygen ions formed, with the effective charge Z = 6, in pinch discharges with pulsed gas admission and a current of several hundreds of kiloamperes.

PACS: 52.75.Va, 52.55.Ez, 52.35.Py

Received: 17.04.1995

 English version: Quantum Electronics, 1997, 27:2, 164–167

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