Steplike intensity threshold behavior of extreme ionization in laser-driven Xe clusters

Details Steplike intensity threshold behavior of extreme ionization in laser-driven Xe clusters Steplike intensity threshold behavior of extreme ionization in laser-driven Xe clusters

2009-08-14

arxiv.org/abs/0908.2145v3

Phys. Ref. Lett 105:053401, 2010

Physics

Atomic and Molecular Clusters

4 pages, 4 figures, content revised

Scientific paper

10.1103/PhysRevLett.105.053401

The generation of highly charged Xe$^{q+}$ ions up to {$q=24$} is observed in Xe clusters embedded in helium nanodroplets and exposed to intense femtosecond laser pulses ($\lambda$=800 nm). Laser intensity resolved measurements show that the high-$q$ ion generation starts at an unexpectedly low threshold intensity of about {10$^{14}$ W/cm$^{2}$}. Above threshold, the Xe ion charge spectrum saturates quickly and changes only weakly for higher laser intensities. Good agreement between these observations and a molecular dynamics analysis allows us to identify the mechanisms responsible for the highly charged ion production and the surprising intensity threshold behavior of the ionization process.

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