Pressure ionization and line merging in strongly coupled plasmas produced by 100-fs laser pulses

被引：132

作者：

Nantel, M ^{[1
]}

Ma, G ^{[1
]}

Gu, S ^{[1
]}

Cote, CY ^{[1
]}

Itatani, J ^{[1
]}

Umstadter, D ^{[1
]}

机构：

[1] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.80.4442

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 10(23) to 10(21) cm(-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.

引用

页码：4442 / 4445

页数：4

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