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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2001 Volume 74, Issue 7, Pages 412–416 (Mi jetpl4226)

This article is cited in 14 papers

PLASMA, GASES

Influence of ultrashort laser pulse duration on the X-ray emission spectrum of plasma produced in cluster target

A. I. Magunova, T. A. Pikuzb, I. Yu. Skobelevb, A. Ya. Faenovb, F. Blascoc, F. Dorchiesc, T. Caillaudc, C. Bontec, F. Salinc, C. Stenzc, P. A. Lobodad, I. A. Litvinenkod, V. V. Popovad, G. V. Baydind, G. C. Junkel-Vivese, J. Abdallah (jr.)e

a A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow
b All-Russian Scientific Research Institute of Physical-Technical and Radiotechnical Measurements, Mendeleevo, Moscow region
c CELIA
d Russian Federal Nuclear Center E. I. Zababakhin All-Russian Scientific Research Institute of Technical Physics, Snezhinsk
e Theoretical Division, T-4, Los Alamos National Laboratory

Abstract: Line emission spectrum of a laser plasma produced in an argon cluster jet target was measured on the $n^1P_1-1^1 S_0 (n=5-9)$ transitions of the helium-like Ar XVII ion for a pulse duration varying from $45$ fs to $1.1$ ps and a constant fluence of $\sim105\,$ J/cm$^2$. The independent modeling of the relative intensities of the transitions from the $n=5,\dots, 10$ levels, as well as of the $2^1P_1-1^2S_0$ and $2^3P_1-1^2S_0$ lines and dielectronic satellites indicates that the electron temperature is anomalously low and that the electron density in emitting plasma increases with shortening the laser pulse. The excitation from the ground state by a small fraction of hot electrons is expected to be the main channel of populating the Ar XVII levels.

PACS: 32.30.Rj, 41.50.+h, 52.25.Nr, 52.50.Jm

Received: 29.08.2001


 English version:
Journal of Experimental and Theoretical Physics Letters, 2001, 74:7, 375–379

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