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Inversion and gain in hydrogenic ion levels induced by photoionization pumping

Goodwin, D. G. and Fill, E. E. (1988) Inversion and gain in hydrogenic ion levels induced by photoionization pumping. Journal of Applied Physics, 64 (3). pp. 1005-1014. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:GOOjap88

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Abstract

If a low-Z plasma is subjected to ionizing radiation, stationary inversions on hydrogenic ion level populations occur. The plasma conditions and pumping requirements to achieve gain on the Lyman-alpha and Balmer-alpha lines are investigated by means of a collisional-radiative model. The calculations are carried out for two cases: first, for the case in which the electron temperature is determined solely by radiative cooling, and second, for the case in which additional electron cooling is provided. In the first case, measurable gain on the Balmer-alpha line is found, although the Lyman-alpha transition remains uninverted. In the second case, the Balmer-alpha gain is dramatically enhanced, and sizable Lyman-alpha gain is predicted.


Item Type:Article
Additional Information:Copyright © 1988 American Institute of Physics. (Received 14 December 1987; accepted 24 March 1988) This work was supported in part by the Commission of the European Communities in the framework of the Association Euroatom/IPP.
Subject Keywords:X−RAY LASERS; GAS LASERS; OPTICAL PUMPING; ENERGY−LEVEL TRANSITIONS; BALMER LINES; LYMAN LINES; IONIZATION; ELECTRON TEMPERATURE; MATHEMATICAL MODELS
Record Number:CaltechAUTHORS:GOOjap88
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GOOjap88
Alternative URL:http://dx.doi.org/10.1063/1.341909
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8807
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:18 Sep 2007
Last Modified:26 Dec 2012 09:42

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