The interactions of ultra-short high-intensity laser pulses with large molecules and clusters: Experimental and computational studies

DOI PDF 被引用文献4件
  • S. Sakabe
    Graduate School of Engineering and Institute of Laser Engineering, Osaka University, 2-1 Yamadaoka, Suita Osaka 565-0871, Japan
  • K. Nishihara
    Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita Osaka 565-0871, Japan
  • N. Nakashima
    Graduate School of Science, Osaka City University, 3-3-138 Sugimoto Sumiyoshi, Osaka 558-8585, Japan
  • J. Kou
    Graduate School of Science, Osaka University, 1-16 Machikaneyama Toyonaka, Osaka 560-0043, Japan
  • S. Shimizu
    Graduate School of Science, Osaka City University, 3-3-138 Sugimoto Sumiyoshi, Osaka 558-8585, Japan
  • V. Zhakhovskii
    Institute for Laser Technology, 1-8-4 Utsubo-Honmachi, Nishi, Osaka 550-0004, Japan
  • H. Amitani
    Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama Toyonaka, Osaka 560-8531, Japan
  • F. Sato
    Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita Osaka 565-0871, Japan

抄録

<jats:p>Recent experimental and computational studies on intense short-pulse-laser interactions with small objects such as molecules (C60) and clusters are reviewed. An anisotropic Coulomb explosion of C60 was observed, on irradiation by a high-intensity laser pulse (1×1016 W/cm2). The energy distributions of Cq+ ions (q=1–4) (distributed over 1 keV) generated from the explosion process were characterized, with their dependence on laser polarization. These results are qualitatively explained by classical molecular-dynamics simulation. It was clearly established that the crucial process for the anisotropic Coulomb explosion is not electron impact ionization, but cascade hopping of electrons. An analytical model and three-dimensional particle simulations of intense laser interaction with a cluster of overdense plasma are presented. When the laser intensity is above a critical value, it blows off all electrons from the cluster and forms a non-neutral ion cloud. During the Coulomb explosion of the ion cloud, ions acquire energy. Ion energy spectra are discussed in detail for different densities and sizes of clusters with various laser intensities. It is shown that ultra-fast ions are produced for relatively large clusters, and that the ion energy reaches to three times greater than the maximum electrostatic potential energy of the ion cloud. The laser-driven Coulomb explosion of a cluster may provide a new high-energy ion source.</jats:p>

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