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14 November 2001 Subpicosecond dynamics of intense laser-cluster interaction: keV x rays and highly charged ion production
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We have performed studies of keV x-ray production from (formula available in paper) rare gas clusters submitted to intense IR laser pulses. Up to (formula available in paper) per pulse at a moderate atomic density have been observed. High resolution spectroscopy studies in the case of (formula available in paper) clusters have also been performed, gibing unambiguous evidence of highly charge ions with K vacancies production. We have determined the photon energies and the absolute photon emission yields as a function of several physical parameters governing the interaction: size and atomic number of the clusters, peak intensity of the laser. Unexpectedly low laser intensity thresholds have been measured. The result obtained indicate nevertheless that x-rays may be emitted before cluster explosion on a subpicosecond time scale, and that several mechanisms must be involved in the first stage of the production of the hot nanoplasma induced from each cluster.
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Emily Lamour, Serge Dreuil, Jean-Claude J. Gauthier, Olivier Gobert, Pierre Meynadier, Didier Normand, Michel Perdrix, Catherine Prigent, J.M. Ramillon, Jean Pierre Rozet, and Dominique Vernhet "Subpicosecond dynamics of intense laser-cluster interaction: keV x rays and highly charged ion production", Proc. SPIE 4504, Applications of X Rays Generated from Lasers and Other Bright Sources II, (14 November 2001);

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