| ATOMIC AND MOLECULAR PHYSICS |
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Intensity and Polarization Effects in Short-Pulse Multiphoton Ionization of Xenon |
| KANG Hui-Peng1,2**, WANG Chuan-Liang1,2, LIN Zhi-Yang1,2, CHEN Yong-Ju1,2, WU Ming-Yan1,2, QUAN Wei1, LIU Hong-Ping1, LIU Xiao-Jun1***
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1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2Graduate School of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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KANG Hui-Peng, WANG Chuan-Liang, LIN Zhi-Yang et al 2011 Chin. Phys. Lett. 28 083201 |
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Abstract We present photoelectron spectra (PES) of xenon subject to ultrashort intense laser pulses at 400 nm. The intensity-dependent PES exhibit the dominance of ac-Stark-shifted multiphoton resonances in a multiphoton ionization process. A distinct difference in the spectra with different laser polarization states (i.e., linearly and circularly polarized states) is revealed and can be understood in terms of the quantum selection rule, which restricts the angular momentum of states that may shift into multiphoton resonances. Furthermore, the intensity dependence of the resonance-enhanced electron yield is analyzed in the context of multiphoton Landau–Zener theory. The model calculation results considering the focal volume effect are in good agreement with the experimental observation.
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| Keywords:
32.80.Rm
42.50.Hz
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Received: 28 April 2011
Published: 28 July 2011
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| PACS: |
32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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