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The momentum distributions of triatomic molecular ion H_(3)^(2+) by intense laser pulses

Communications in Theoretical Physics 2023年第6期75卷 112-119页

作者： Zhi-Xian Lei Shu-Juan Yan Xin-Yu Hao Pan Ma Sheng-Peng Zhou Jing Guo Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

We investigate theoretically the photoionization of triatomic molecular ion H_(3)^(2+) by numerically solving the two-dimensional time-dependent Schrödinger equations under Bohn-Oppenheimer *** results show that the photoelectron momentum distributions(PMDs)of H_(3)^(2+) with different initial states are strongly dependent on the laser ellipticities and molecular orbital symmetry,and the PMDs of degenerate electronic states E^(±)are mirror ***,for degenerate electronic states E^(±),vortex structures appear in the PMDs by the counter-rotating circularly polarized laser pulses as the time delay between the two pulses increases,which can be explained by multicenter ionization and ultrafast photoionization model.

关键词： momentum distribution ringlike molecules intense laser fields

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Observation of the optical X2Σg+–A2Πu coupling in N2+ lasing induced by intense laser field

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Chinese Physics B 2019年第12期28卷 33-37页

作者： Siqi Wang Yao Fu Danwen Yao Shanming Chen Wei Zhang Helong Li Huailiang Xu State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

We propose a simple pump-coupling-seed scheme to examine the optical X^2Σg^+–A^2Πu coupling in N2^+ lasing. We produce the N2^+ lasing at 391 nm, corresponding to the B^2Σu^+(v = 0)–X^2Σg+(v = 0) transition, by externally seeding the N^2+ gain medium prepared by irradiation of N2 with an intense pump pulse. We then adopt a weak coupling pulse in between the pump and seed pulses, and show that the intensity of the 391-nm lasing can be efficiently modulated by varying the polarization direction of the coupling pulse with respect to that of the pump pulse. It is found that when the polarization directions of the pump and coupling pulses are perpendicular, the 391-nm lasing intensity is more sensitive to the coupling laser energy, which reflects the inherent nature of the perpendicular X^2+Σg^–A^2Πu transition.

关键词： air lasing intense laser fields nitrogen molecules

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Review:Coincidence Momentum Imaging:Principle and Application in Molecular Reaction Dynamics

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Journal of Harbin Institute of Technology(New Series) 2018年第4期25卷 1-14页

作者： Li Zhang Huailiang Xu Communications and Electronic Information Department Shanghai Vocational College of Science and Technology State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University

Coincidence Momentum Imaging(CMI) is a powerful imaging technique that can determine the full momentum vectors of all particles released from a single parent molecule in coincidence and thus provide detailed information on transient molecular *** far,the CMI technique has been extensively employed for investigating a variety of molecular reaction dynamics induced,e.g.,by particle collisions,intense laser fields and synchrotron *** this article,we first introduce the principle of the CMI technique,which is followed by several typical experimental designs of the CMI systems realizing the coincidence momentum *** then present representative examples of studying molecular reaction dynamics using the CMI technique.

关键词： Coincidence momentum imaging intense laser fields Molecular reaction dynamics

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