中国物理B ›› 2004, Vol. 13 ›› Issue (10): 1684-1688.doi: 10.1088/1009-1963/13/10/019

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Electron impact ionization of large krypton clusters

李儒新1, 倪国权1, 徐至展1, 李邵辉2   

  1. (1)Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; (2)Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Department of Physics, Shantou University, Shantou 515063, China
  • 收稿日期:2004-01-09 修回日期:2004-05-24 出版日期:2004-10-20 发布日期:2005-06-20
  • 基金资助:
    Project supported by the National Key Basic Research Special Foundation of China (Grant No G1999075200), the National Natural Science Foundation of China (Grant No 29890210) and the Shanghai Foundation of Science and Technology (Grant No 0159nm022).

Electron impact ionization of large krypton clusters

Li Shao-Hui (李邵辉)ab, Li Ru-Xin (李儒新)a, Ni Guo-Quan (倪国权)a, Xu Zhi-Zhan (徐至展)a   

  1. a Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Department of Physics, Shantou University, Shantou 515063, China
  • Received:2004-01-09 Revised:2004-05-24 Online:2004-10-20 Published:2005-06-20
  • Supported by:
    Project supported by the National Key Basic Research Special Foundation of China (Grant No G1999075200), the National Natural Science Foundation of China (Grant No 29890210) and the Shanghai Foundation of Science and Technology (Grant No 0159nm022).

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摘要： We show that the detection of ionization of very large van der Waals clusters in a pulsed jet or a beam can be realized by using a fast ion gauge. Rapid positive feedback electron impact ionization and fragmentation processes, which are initially ignited by electron impact ionization of the krypton clusters with the electron current of the ion gauge, result in the appearance of a progressional oscillation-like ion spectrum, or just of a single fast event under critical conditions. Each line in the spectrum represents a correlated explosion or avalanche ionization of the clusters. The phenomena have been analysed qualitatively along with a Rayleigh scattering experiment of the corresponding cluster jet.

关键词: atomic clusters, ion gauge, electron impact ionization

Abstract: We show that the detection of ionization of very large van der Waals clusters in a pulsed jet or a beam can be realized by using a fast ion gauge. Rapid positive feedback electron impact ionization and fragmentation processes, which are initially ignited by electron impact ionization of the krypton clusters with the electron current of the ion gauge, result in the appearance of a progressional oscillation-like ion spectrum, or just of a single fast event under critical conditions. Each line in the spectrum represents a correlated explosion or avalanche ionization of the clusters. The phenomena have been analysed qualitatively along with a Rayleigh scattering experiment of the corresponding cluster jet.

Key words: atomic clusters, ion gauge, electron impact ionization

中图分类号:  (Molecular excitation and ionization)

  • 34.80.Gs
36.40.Qv (Stability and fragmentation of clusters) 33.20.Fb (Raman and Rayleigh spectra (including optical scattering) ?)