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)
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
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+.
Received: 22 November 2008
Revised: 18 December 2008
Accepted manuscript online:
(Potential energy surfaces for excited electronic states)
Fund: 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).
Cite this article:
Chen De-Ying(陈德应), Zhang Sheng(张盛), and Xia Yuan-Qin(夏元钦) The dissociation pathways of N2+ in intense femtosecond laser fields 2009 Chin. Phys. B 18 3073
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