Charge Resonance Enhanced Multiple Ionization of H2 O Molecules in Intense Laser Fields
LIU Hong1 , LI Min1 , XIE Xi-Guo1 , WU Cong1 , DENG Yong-Kai1 , WU Cheng-Yin1,2 , GONG Qi-Huang1,2 , LIU Yun-Quan1,2**
1 Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 1008712 Collaborative Innovation Center of Quantum Matter, Beijing 100871
Abstract ：We perform a kinetically complete measurement on the fragmentation of Coulomb explosion of H2 O molecules in intense few-cycle linearly and circularly polarized laser fields. Both the fragmentations of H2 O3+ and H2 O4+ reveal the concerted pathway of dissociation. The length of the O–H bond prior to the Coulomb explosion of both molecular ions is sensitive to the laser pulse duration and laser intensity. However, the bending angle of H–O–H is less sensitive to the pulse duration and laser intensity. We introduce the mechanism of charge resonance enhanced double ionization to elucidate the triple (or quadruple) dissociative ionization dynamics of H2 O, in which two electrons are non-adiabatically localized at the protons of the precursor ion H2 O+ 2 O2+ ) and are released simultaneously due to the over barrier ionization in the combined laser field and molecular ionic potential. Such charge resonance enhanced multiple ionization is not suppressed in few-cycle laser fields and elliptically polarized laser fields.
收稿日期: 2015-01-09
出版日期: 2015-06-30
:
33.80.Rv
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
34.50.Gb
(Electronic excitation and ionization of molecules)
42.50.Hz
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
引用本文:
. [J]. 中国物理快报, 2015, 32(06): 63301-063301.
2 O Molecules in Intense Laser Fields. Chin. Phys. Lett., 2015, 32(06): 63301-063301.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/32/6/063301
或
https://cpl.iphy.ac.cn/CN/Y2015/V32/I06/63301
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2015, Vol. 32 
