Laser-Driven Nanoplasmas in Doped Helium Droplets: Local Ignition and Anisotropic Growth

被引：36
|
作者：
Mikaberidze, Alexey [1 ]
Saalmann, Ulf [1 ]
Rost, Jan M. [1 ]
机构：
[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 12期
关键词：
CLUSTER; PULSES; DYNAMICS;
D O I：
10.1103/PhysRevLett.102.128102
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Doping a helium nanodroplet with only a tiny xenon cluster of a few atoms 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: Avalanchelike 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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页数：4
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