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Polarization control in two-color above-threshold ionization of atomic helium

Meyer, M. and Cubaynes, D. and Glijer, D. and Dardis, John and Hayden, Patrick and Hough, Pádraig and Richardson, Vincent and Kennedy, Eugene T. and Costello, John T. and Radcliffe, P. and Düsterer, S. and Azima, A. and Li, W. and Redlin, H. and Feldhaus, J. and Taïeb, R. and Maquet, A. and Grum-Grzhimailo, A. and Gryzlova, E. and Strakhova, S. (2008) Polarization control in two-color above-threshold ionization of atomic helium. Physical Review Letters, 101 (19). pp. 193002-1. ISSN 0031-9007

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Abstract

Two-color multiphoton ionization of atomic helium was investigated by combining extreme ultraviolet (XUV) radiation from the Free Electron Laser in Hamburg with an intense synchronized optical laser. In the photoelectron spectrum, lines associated with direct ionization and above-threshold ionization show strong variations of their amplitudes as a function of both the intensity of the optical dressing field and the relative orientation of the linear polarization vectors of the two fields. The polarization dependence provides direct insight into the symmetry of the outgoing electrons in above-threshold ionization. In the high field regime, the monochromaticity of the XUV radiation enables the unperturbed observation of nonlinear processes in the optical field.

Item Type:Article (Published)
Refereed:Yes
Subjects:Physical Sciences > Physics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:The American Physical Society
Official URL:http://dx.doi.org/10.1103/PhysRevLett.101.193002
Copyright Information:© 2008 The American Physical Society
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Higher Education Authority
ID Code:15603
Deposited On:05 Aug 2010 14:39 by DORAS Administrator. Last Modified 10 Aug 2010 13:58

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