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Article Dans Une Revue Journal of Physics B: Atomic, Molecular and Optical Physics Année : 2001

Spin-polarized electrons produced by a sequence of two femtosecond pulses. Calculation of differential and global polarization rates

Résumé

This paper presents a theoretical analysis of the possibilities of producing spin-polarized electrons with a sequence of two ultra-short time-delayed laser pulses. The first pulse, which is right circularly polarized, excites resonantly the fine structure np level of potassium atoms leading to a spin-flip and thus polarizing the atom. The second pulse ionizes the system thereby resulting in spin-polarized electron release. We examine and compare several situations corresponding to different polarizations of the ionizing pulse (σ+,σ- and π). For each case we derive analytical expressions for the angular and global electron spin-polarization rates as well as for the differential cross sections. The obtained rates can be very high (up to 100%) and can be controlled accurately on the femtosecond time scale by varying the time delay between the pulses.

Dates et versions

hal-00005041 , version 1 (15-06-2005)

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Citer

M. A. Bouchene, Sébastien Zamith, Bertrand Girard. Spin-polarized electrons produced by a sequence of two femtosecond pulses. Calculation of differential and global polarization rates. Journal of Physics B: Atomic, Molecular and Optical Physics, 2001, 34 (8), pp.1497-1512. ⟨10.1088/0953-4075/34/8/313⟩. ⟨hal-00005041⟩
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