Pressure Ionization and Line Merging in Strongly Coupled Plasmas Produced by 100-fs Laser Pulses

M. Nantel, G. Ma, S. Gu, C. Y. Côté, J. Itatani, D. Umstadter

Research output: Contribution to journalArticle

123 Scopus citations

Abstract

Time- and space-resolved extreme ultraviolet spectra of carbon plasmas, created with 100-fs laser pulses, are obtained with the novel technique of picosecond jitter-free streak-camera averaging. Spectroscopic diagnostics indicate electron densities and temperatures evolving from 1023 to 1021cm-3 and 80 to 50 eV, respectively, implying less than one particle in a Debye sphere at early times. The emission reveals conditions of extreme pressure ionization and line merging. Comparisons of the experimental spectra with numerical simulations validate the use of the Inglis-Teller limit for line merging, and confirm that pressure ionization models based on the Debye-Huckel potential are inapplicable in such strongly coupled plasmas.

Original languageEnglish (US)
Pages (from-to)4442-4445
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number20
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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