中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2426-2431.doi: 10.1088/1674-1056/18/6/051

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Dynamics simulation on interaction of intense laser pulses with atomic clusters

杜洪川1, 孙少华1, 刘作业1, 李露1, 马玲玲1, 胡碧涛1, 朱鹏佳2   

  1. (1)School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; (2)School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;School of Modern Physics, University of Science and Technology of China, Hefei 200036, China
  • 收稿日期:2008-12-23 修回日期:2009-01-06 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Projects supported by the National Natural Science Foundation of China (Grant Nos 10575046 and 10775062).

Dynamics simulation on the interaction of intense laser pulses with atomic clusters

Du Hong-Chuan(杜洪川)a), Zhu Peng-Jia(朱鹏佳)a)b), Sun Shao-Hua(孙少华)a), Liu Zuo-Ye(刘作业)a), Li Lu(李露)a), Ma Ling-Ling(马玲玲)a), and Hu Bi-Tao(胡碧涛)a)†   

  1. a School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; b School of Modern Physics, University of Science and Technology of China, Hefei 200036, China
  • Received:2008-12-23 Revised:2009-01-06 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Projects supported by the National Natural Science Foundation of China (Grant Nos 10575046 and 10775062).

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摘要： Under classical particle dynamics, the interaction process between intense femtosecond laser pulses and icosahedral noble-gas atomic clusters was studied. Our calculated results show that ionization proceeds mainly through tunnel ionization in the combined field from ions, electrons and laser, rather than the electron-impact ionization. With increasing cluster size, the average and maximum kinetic energy of the product ion increases. According to our calculation, the expansion process of the clusters after laser irradiation is dominated by Coulomb explosion and the expansion scale increases with increasing cluster size. The dependence of average kinetic energy and average charge state of the product ions on laser wavelength is also presented and discussed. The dependence of average kinetic energy on the number of atoms inside the cluster was studied and compared with the experimental data. Our results agree with the experimental results reasonably well.

关键词: intense femtosecond laser pulse, Coulomb explosion, cluster, tunnel ionization

Abstract: Under classical particle dynamics, the interaction process between intense femtosecond laser pulses and icosahedral noble-gas atomic clusters was studied. Our calculated results show that ionization proceeds mainly through tunnel ionization in the combined field from ions, electrons and laser, rather than the electron-impact ionization. With increasing cluster size, the average and maximum kinetic energy of the product ion increases. According to our calculation, the expansion process of the clusters after laser irradiation is dominated by Coulomb explosion and the expansion scale increases with increasing cluster size. The dependence of average kinetic energy and average charge state of the product ions on laser wavelength is also presented and discussed. The dependence of average kinetic energy on the number of atoms inside the cluster was studied and compared with the experimental data. Our results agree with the experimental results reasonably well.

Key words: intense femtosecond laser pulse, Coulomb explosion, cluster, tunnel ionization

中图分类号:  (Autoionization, photoionization, and photodetachment)

  • 33.80.Eh
31.15.-p (Calculations and mathematical techniques in atomic and molecular physics) 36.40.Sx (Diffusion and dynamics of clusters)