中国物理B ›› 2009, Vol. 18 ›› Issue (7): 3073-3078.doi: 10.1088/1674-1056/18/7/077

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The dissociation pathways of N2+ in intense femtosecond laser fields

陈德应1, 夏元钦1, 张盛2   

  1. (1)National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China; (2)National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2008-11-22 修回日期:2008-12-18 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774033, 60878018 and 10674036) and program for New Century Excellent Talents in University of China (NCET).

The dissociation pathways of N2+ in intense femtosecond laser fields

Chen De-Ying(陈德应)a)† , Zhang Sheng(张盛)a)b), and Xia Yuan-Qin(夏元钦)a)   

  1. a National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China; b Department of Physics, Harbin Institute of Technology, Harbin 150001, China
  • Received:2008-11-22 Revised:2008-12-18 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774033, 60878018 and 10674036) and program for New Century Excellent Talents in University of China (NCET).

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摘要： Using a neutral N2 beam as target, this paper studies the dissociation of N2+ in intense femtosecond laser fields (45~fs, ～ 1× 1016~W/cm2) at the laser wavelength of 800 nm based on the time-of-flight mass spectra of N+ fragment ions. The angular distributions of N+ and the laser power dependence of N+ yielded from different dissociation pathways show that the dissociation mechanisms mainly proceed through the couplings between the metastable states (A, B and C) and the upper excited states of N2+. A coupling model of light-dressed potential energy curves of N2+ is used to interpret the kinetic energy release of N+.

Abstract: Using a neutral N2 beam as target, this paper studies the dissociation of N2+ in intense femtosecond laser fields (45 fs, ～1×1016 W/cm2) at the laser wavelength of 800 nm based on the time-of-flight mass spectra of N+ fragment ions. The angular distributions of N+ and the laser power dependence of N+ yielded from different dissociation pathways show that the dissociation mechanisms mainly proceed through the couplings between the metastable states (A, B and C) and the upper excited states of N2+. A coupling model of light-dressed potential energy curves of N2+ is used to interpret the kinetic energy release of N+.

Key words: dissociation mechanisms, intense femtosecond laser fields, time-of-flight mass spectra

中图分类号:  (Diffuse spectra; predissociation, photodissociation)

  • 33.80.Gj
33.15.Ta (Mass spectra) 31.50.Df (Potential energy surfaces for excited electronic states)