Polarization Control in Two-Color Above-Threshold Ionization of Atomic Helium

Journal Article · Fri Nov 07 04:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.193002· OSTI ID:21179889

Meyer, M; Cubaynes, D; Glijer, D ^[1]; Dardis, J; Hayden, P; Hough, P; Richardson, V; Kennedy, E T; Costello, J T ^[2]; Radcliffe, P; Duesterer, S; Azima, A; Li, W B; Redlin, H; Feldhaus, J ^[3]; Taieeb, R; Maquet, A ^[4]; Grum-Grzhimailo, A N; Gryzlova, E V; Strakhova, S I ^[5]

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1. LIXAM, UMR 8624, CNRS-Universite Paris Sud, Batiment 350, 91405 Orsay Cedex (France)
2. National Center for Plasma Science and Technology and School of Physical Sciences, Dublin City University, Dublin (Ireland)
3. HASYLAB at DESY, Notkestr. 85, D-22607 Hamburg (Germany)
4. UPMC, Universite Paris 06, CNRS, UMR 7614, LCPMR, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)
5. Institute of Nuclear Physics, Moscow State University, Moscow 119991 (Russian Federation)

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.

• OSTI ID: 21179889
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRONS
EXTREME ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
HELIUM
NONLINEAR PROBLEMS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
POLARIZATION