| ATOMIC AND MOLECULAR PHYSICS |
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Positron-Impact Ionization of Atomic Hydrogen in a Bichromatic Laser Field in the Second Born Approximation |
| LOU Jun1, LI Shu-Min1,2 |
1Department of Modern Physics, University of Science and Technology of China, P.O. Box 4, Hefei 230026
2Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
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| Cite this article: |
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LOU Jun, LI Shu-Min 2010 Chin. Phys. Lett. 27 103401 |
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Abstract The positron impact-ionization of atomic hydrogen in the presence of a linearly polarized bichromatic field is investigated in the second Born approximation. The field is composed of a fundamental frequency and its second harmonic. The state of positron in the field is described by the Volkov wavefunction, and the continuum state of the ejected electron is described by the Coulomb-Volkov wavefunction. The dressed ground state of target is a first order time-dependent perturbative wavefunction. The triple differential cross sections and their dependencies on laser field parameters are discussed. Numerical results demonstrate that the second-order effect plays a crucial role in understanding the laser-assisted positron scattering process.
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| Keywords:
34.50.Rk
34.80.Uv
32.80.Qk
34.80.Qb
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Received: 01 March 2010
Published: 26 September 2010
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| PACS: |
34.50.Rk
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(Laser-modified scattering and reactions)
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34.80.Uv
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(Positron scattering)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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34.80.Qb
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(Laser-modified scattering)
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