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Positron-impact ionisation of atomic hydrogen in the presence of a bichromatic laser field |
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| Authors: | Lou Jun and Li Shu-Min |
| Institution: | Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China; Institut für Theoretische Physik, Universit?t Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany |
| Abstract: | The positron impact-ionisation of atomic hydrogen in the presence of a linearly polarised bichromatic field is investigated in the first 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 and compared with the results modified by a monochromatic field. Numerical results show that the coherent phase control is significant and the laser-assisted ionisation cross sections caused by positron and electron are different. |
| Keywords: | bichromatic laser field positron impact-ionisation |
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