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Classical Dynamics of Harmonic Generation of the Hydrogen
Molecular Ion Interacting with Ultrashort Intense Laser Pulses |
| LI Chao-Hong1,4;DUAN Yi-Wu1;Wing-Ki Liu2;Jian-Min Yuan3 |
| 1Department of Physics, Hu’nan Normal University, Changsha 410081
2Department of Physics, University of Waterloo, Waterloo, Ontario, N2L3G1, Canada%endaddress
3Department of Physics and Atmospheric Science, Drexel University, Philadelphia, PA19104, USA
4Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 |
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| Cite this article: |
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LI Chao-Hong, DUAN Yi-Wu, Wing-Ki Liu et al 2001 Chin. Phys. Lett. 18 236-238 |
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Abstract Within Born--Oppenheimer approximation, by using the classical trajectory theory, a description for the high-order harmonic generation of the hydrogen molecular ion interacting with ultrashort laser pulses has been presented. The Coulomb singularities have been remedied by the regularization. The action-angle variables have been used to generate the initial inversion symmetry microcanonical distribution. Within a proper intensity range, a harmonic plateau with only odd harmonics appears. For a larger intensity, because of the existence of chaos, the harmonic spectra become noisier. For a large enough intensity, the ionization takes place and the harmonics disappear. So the chaos causes the noises, the ionization suppresses the harmonic generation, and the onset of the ionization follows the onset of chaos.
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| Keywords:
42.65.Ky
32.80.Wr
32.80.Rm
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Published: 01 February 2001
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| PACS: |
42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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32.80.Wr
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(Other multiphoton processes)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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