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Article Dans Une Revue Journal of Physics B: Atomic, Molecular and Optical Physics Année : 2010

Electron angular distributions in near-threshold atomic ionization

Résumé

We present angle- and energy-resolved measurements of photoelectrons produced in strongfield ionisation of Xe using a tunable femtosecond laser. An occurrence of highly oscillatory patterns in the angular distribution at low photoelectron kinetic energy is observed that correlates with channel closing/opening over a wide range of laser parameters. The correlation is investigated both experimentally and by means of systematic analysis of numerical solutions of the time-dependent Schrödinger equation (TDSE). Our experimental and numerical results are in quantitative agreement with the semi-classical model introduced by Arbó et al. (Phys. Rev. A 78, 013406 (2008)), which relates the oscillatory patterns to interference between photoelectrons produced during different cycles of the laser pulse in the course of non-resonant ionisation of the atom. We observe that an increase of the laser intensity eventually leads to qualitative invariance of the pattern, defining a limit on the applicability of the semi-classical model.

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Dates et versions

hal-00569916 , version 1 (25-02-2011)

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T Marchenko, H G Muller, K J Schafer, M J J Vrakking. Electron angular distributions in near-threshold atomic ionization. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (9), pp.95601. ⟨10.1088/0953-4075/43/9/095601⟩. ⟨hal-00569916⟩
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