Abstract

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Cluster ionization in intense extreme-ultraviolet and near-infrared pulses

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Cluster ionization in intense extreme-ultraviolet and near-infrared pulses


B. Schütte1, J. Lahl2, T. Oelze2, M. Arbeiter3, Th. Fennel3, K. Gokhberg4, G. Jabbari4, A. I. Kuleff4, M. Krikunova2, M. J. J. Vrakking1, A. Rouzée1,*

1Max-Born-Institut, Max Born Straße 2A, 12489 Berlin, Germany

2Institut für optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, EW 3-1, 10623 Berlin Germany

3Institut für Physik, Universität Rostock, Universitätsplatz 3, 18055 Rostock,Germany

4Theoretische Chemie, PCI, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany

Laser-cluster interaction is of fundamental interest for the understanding of many-body physics and electron-electron correlation effects. When an intense near-infrared (NIR) or extreme-ultraviolet (XUV) laser pulse interacts with a cluster, a large number of electrons and high charge ions are generated. If the ionization step depends of the wavelength, for sufficiently intense laser field, the build-up of the potential as electrons are stripped away from the cluster leads to the formation of quasi-free electrons and a nanoplasma. At the early stage of the cluster expansion, the nanoplasma cools down by evaporative electron emission. Charge recombination processes also take place leading to the formation of excited atoms. We investigate here the role of charge recombination processes in the ionization and dissociation dynamics of rare gas and molecular clusters induced by intense XUV and NIR laser pulses. Using time-resolved photoion and photoelectron spectroscopy, we observe that a large number of excited atoms are formed within the first few picosecond of the cluster expansion [1,2]. Surprisingly, we found that the relaxation of these excited atoms open novel ionization channels driven by electron correlation effects or by autoionization [3]. Experimental signatures of electron-correlation driven energy transfer following charge recombination in both rare gas and molecular clusters will be presented and discussed.

References:

[1] B. Schütte et al., Phys. Rev. Lett. 112, 073003 (2014).

[2] B. Schütte et al., Phys. Rev. Lett. 112, 253401 (2014).

[3] B. Schütte et al., Phys. Rev. Lett. 114, 123002 (2015).