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

Wavelength dependence of photoelectron spectra in above-threshold ionization

Résumé

We present angle- and energy-resolved measurements of photoelectrons produced in strongfield ionization of Xe and Ar using a tunable femtosecond laser in the wavelength range between 600 and 800 nm. Systematic analysis of the experimental data that are quantitatively reproduced by numerical solutions of the time-dependent Schrödinger equation with integration over the laser focal volume, demonstrates the dominance of resonance-enhanced ionization. Continuous variation of the laser wavelength allows the identification of a number of consecutive channel-switching effects with a reliable assignment of the intermediate Rydberg states involved. The appearance of the resonant sub-structure in the electron energy spectra is influenced by the presence of a non-resonant contribution. At relatively low laser intensity a coherent addition of resonant and non-resonant ionization processes is observed. Due to the absence of an intensity dependence in the resonance-enhanced ionization, we observe the persistence of Freeman resonances at the transition to the tunnelling regime.

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Dates et versions

hal-00569831 , version 1 (25-02-2011)

Identifiants

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T Marchenko, H G Muller, K J Schafer, M J J Vrakking. Wavelength dependence of photoelectron spectra in above-threshold ionization. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (18), pp.185001. ⟨10.1088/0953-4075/43/18/185001⟩. ⟨hal-00569831⟩
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