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Coulomb and polarization effects in laser-assisted XUV ionization

2006; IOP Publishing; Volume: 39; Issue: 13 Linguagem: Inglês

10.1088/0953-4075/39/13/s06

1361-6455

Olga Smirnova, Michael Spanner, Misha Ivanov,

Laser-Plasma Interactions and Diagnostics

We consider spectra of one-photon ionization of an atom by an attosecond XUV pulse in the presence of an intense laser pulse, for different delays between the laser and the XUV pulses. Such a spectrogram, which is expected to record the instantaneous laser field, is distorted by the influence of the Coulomb atomic potential on the electron motion after XUV ionization and by the laser-induced polarization of the initially bound electron wave packet before XUV ionization. We analyse these distortions using consistently-derived Coulomb-corrected wavefunctions of the strongly-driven continuum electron. We demonstrate quantitative accuracy of these wavefunctions and of the corresponding photoelectron spectra. We then show how the Coulomb-corrected wavefunctions can be used to disentangle Coulomb and polarization effects in the spectrogram, opening the route to attosecond XUV dynamical imaging of the electronic wave packet undergoing strong-field distortion and ionization.