Positron-impact ionisation of atomic hydrogen in the presence of a bichromatic laser field

doi:10.1088/1674-1056/19/11/113405

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

Received: 17 March 2010
Revised: 20 July 2010
Accepted manuscript online:

PACS:	31.15.xp	(Perturbation theory)
	32.80.Fb	(Photoionization of atoms and ions)
	32.80.Qk	(Coherent control of atomic interactions with photons)
	34.80.Uv	(Positron scattering)
	37.10.Vz	(Mechanical effects of light on atoms, molecules, and ions)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10874169 and 10674125), the National Basic Research Program of China (Grant Nos. 2007CB925200 and 2010CB923301). Li S. M. would like to thank the Deutsche Forschungsgemeinschaft for the support (Contract No. 446CHV113/261/0-1) during his stay in Germany.

Cite this article:

Lou Jun(娄俊) and Li Shu-Min(李书民) Positron-impact ionisation of atomic hydrogen in the presence of a bichromatic laser field 2010 Chin. Phys. B 19 113405

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Positron-impact ionisation of atomic hydrogen in the presence of a bichromatic laser field

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