Interaction of intense vuv radiation with large xenon clusters

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Zachary B. Walters,¹ Robin Santra,² and Chris H. Greene¹
¹Department of Physics and JILA, University of Colorado, Boulder, Colorado 80309-0440, USA
²Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 19 April 2006; published 26 October 2006

Theinteraction of atomic clusters with short, intense pulses of laserlight to form extremely hot, dense plasmas has attracted extensiveexperimental and theoretical interest. The high density of atoms withinthe cluster greatly enhances the atom-laser interaction, while the finitesize of the cluster prevents energy from escaping the interactionregion. Recent technological advances have allowed experiments to probe thelaser-cluster interaction at very high photon energies, with interactions muchstronger than suggested by theories for lower photon energies. Wepresent a model of the laser-cluster interaction that uses nonperturbativeR-matrix techniques to calculate inverse bremsstrahlung and photoionization cross sectionsfor Herman-Skillman atomic potentials. We describe the evolution of thecluster under the influence of the processes of inverse bremsstrahlungheating, photoionization, collisional ionization and recombination, and expansion of thecluster. We compare total energy absorbed with the Hamburg experimentof Wabnitz et al. [Nature 420, 482 (2002)] and ejected electronspectra with Laarmann et al. [Phys. Rev. Lett. 95, 063402 (2005)].

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.043204
DOI:	10.1103/PhysRevA.74.043204
PACS:	36.40.Gk; 32.80.-t; 52.50.Jm; 52.20.Fs 36.40.Gk Plasma and collective effects in atomic and molecular clusters 32.80.-t Photon interactions with atoms 52.50.Jm Plasma production and heating by laser beams including laser–foil, laser–cluster, etc 52.20.Fs Electron collisions in plasma YEAR: 2006
KEYWORDS:	xenon, atomic clusters, molecule-photon collisions, plasma production by laser, photoionisation, bremsstrahlung

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