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Proceedings Paper

Estimates of population inversion for deep-UV transitions in Kr-like Y, Zr, Nb, and Mo in a high-current reflex discharge
Author(s): Kevin B. Fournier; D. Stutman; Vlad Soukhanovskii; Michael Finkenthal; M. J. May; Vyacheslav N. Shlyaptsev; William H. Goldstein
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Paper Abstract

Kr-like ions are good candidates for FUV lasing since they can be produced in plasmas quite easily. We present results from a spectroscopic investigation of Y IV emission from a high current density, cold cathode reflex discharge. The Y II to Y V emission is recorded in the 200 - 3000 angstroms range using photometrically calibrated spectrometers, while the emission of trace aluminum ions serves for plasma diagnostics. The intensities of the Y IV 4d - 5p and 5s - 5p transitions strongly increase relative to lines from Y II and Y III with increasing plasma current. The spectra studied here are obtained at a current density of 1.75 A/cm2. Experimental Y IV intensity ratios spanning several excited configurations are compared with collisional radiative predictions of the HULLAC atomic physics package. Good agreement is found for the measured and predicted ratios of 4p55p to 4p55s level populations per statistical weight. Finally, the response of the Kr-like system to a fast, transient excitation pulse is examined using the RADEX code. Large transient gains are predicted for several 5s - 5p transitions in Y IV, Zr V, Nb VI and Mo VII.

Paper Details

Date Published: 21 October 1999
PDF: 12 pages
Proc. SPIE 3776, Soft X-Ray Lasers and Applications III, (21 October 1999); doi: 10.1117/12.366669
Show Author Affiliations
Kevin B. Fournier, Lawrence Livermore National Lab. (United States)
D. Stutman, Johns Hopkins Univ. (United States)
Vlad Soukhanovskii, Johns Hopkins Univ. (United States)
Michael Finkenthal, Johns Hopkins Univ. (United States)
M. J. May, Johns Hopkins Univ. (United States)
Vyacheslav N. Shlyaptsev, Lawrence Livermore National Lab. (United States)
William H. Goldstein, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3776:
Soft X-Ray Lasers and Applications III
Jorge J. G. Rocca; Luiz Barroca Da Silva, Editor(s)

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