Laser-driven nanoplasmas in doped helium droplets: Local ignition and anisotropic expansion

Details Laser-driven nanoplasmas in doped helium droplets: Local ignition and anisotropic expansion Laser-driven nanoplasmas in doped helium droplets: Local ignition and anisotropic expansion

2009-02-16

arxiv.org/abs/0902.2635v1

Phys. Rev. Lett. 102, 128102 (2009)

Physics

Atomic and Molecular Clusters

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.128102

Doping a helium nanodroplet with a tiny xenon cluster of a few atoms only, sparks complete ionization of the droplet at laser intensities below the ionization threshold of helium atoms. As a result, the intrinsically inert and transparent droplet turns into a fast and strong absorber of infrared light. Microscopic calculations reveal a two-step mechanism to be responsible for the dramatic change: Avalanche-like ionization of the helium atoms on a femtosecond time scale, driven by field ionization due to the quickly charged xenon core is followed by resonant absorption enabled by an unusual cigar-shaped nanoplasma within the droplet.

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