Dynamics of Coulomb explosion of hydrogen clusters in a high-intensity femtosecond laser pulse |
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作者姓名: | 蔡旭红 张培晴 蒋月 李邵辉 |
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作者单位: | Department of Physics,Department of Physics,Department of Physics,Department of Physics Shantou University,Shantou 515063,Shantou University,Shantou 515063,Shantou University,Shantou 515063,Shantou University,Shantou 515063 |
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基金项目: | This work was supported by the National Natural Sci- ence Foundation of China under Grant No. 60408008. |
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摘 要: | Using Bethe model, the dynamics of the ionization and Coulomb explosion of hydrogen clusters (0.5-5 nm) in high-intensity (1015 -1017 W/cm2) femtosecond laser pulses have been studied theoretically, and the dependence of energy of protons emitted from exploding clusters on cluster size and laser intensity has been investigated. It is found that the maximum proton energy increases exponentially with the cluster size, and the exponent is mainly determined by the laser intensity. For a given cluster size, the maximum proton energy increases with increasing laser intensity and gets saturation gradually. The calculation results are in agreement with the recent experimental observation.
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