Laser phase effect on asymmetric harmonic distribution in H_2~+ |
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| Affiliation: | 1.College of Science, Liaoning University of Technology, Jinzhou 121000, China;2.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;3.Key Laboratory at Universities of Education Department of Xinjiang Uygur Autonomous Region for New Energy Materials, Xinjiang Institute of Engineering, Urumqi 830091, China |
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| Abstract: | The laser phase effect on the spatial distribution of the molecular high-order harmonic generation (MHHG) spectrum from H2+ is theoretically investigated through solving the Non-Bohn-Oppenheimer (NBO) time-dependent Schrödinger equation (TDSE). The results are shown as follows. (i) The generated harmonics from the two nuclei each present an asymmetric distribution. Particularly, when the laser phases are chosen from 0.0π to 0.6π and from 1.7π to 2.0π, the contribution from the negative-H plays a main role in harmonic generation. When the laser phases are chosen from 0.7π to 1.6π, the contribution from the positive-H to the harmonic generation is remarkably enhanced and becomes greater than that from the negative-H. The electron localization, the time-frequency analyses of the harmonic spectrum and the time-dependent wave function are shown to explain the asymmetric harmonic distribution in H2+, which provides us with a method to control the electron motion in molecules. (ii) As the pulse duration increases, the asymmetric distributions of the MHHG in two H nuclei decrease. (iii) Isotope investigation shows that the asymmetric harmonic distribution can be reduced by introducing the heavy nucleus (i.e., D2+). |
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| Keywords: | molecular high-order harmonic generation spatial distribution of molecular harmonics laser phase effect isotope effect |
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