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Studying the universality of field induced tunnel ionization times via high-order harmonic spectroscopy (Articolo in rivista)

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Studying the universality of field induced tunnel ionization times via high-order harmonic spectroscopy (Articolo in rivista) (literal)

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Soifer, H.; Bruner, B. D.; Negro, M.; Devetta, M.; Facciala, D.; Vozzi, C.; de Silvestri, S.; Stagira, S.; Dudovich, N. (2014)
Studying the universality of field induced tunnel ionization times via high-order harmonic spectroscopy
in Journal of physics. B, Atomic molecular and optical physics (Print)
(literal)

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Soifer, H.; Bruner, B. D.; Negro, M.; Devetta, M.; Facciala, D.; Vozzi, C.; de Silvestri, S.; Stagira, S.; Dudovich, N. (literal)

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1 Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel 2 Institute for Photonics and Nanotechnologies, CNR, Milano, Italy 3 Department of Physics, Politecnico di Milano, Milano, Italy (literal)

Titolo

Studying the universality of field induced tunnel ionization times via high-order harmonic spectroscopy (literal)

Abstract

High-harmonic generation spectroscopy is a promising tool for resolving electron dynamics and structure in atomic and molecular systems. This scheme, commonly described by the strong field approximation, requires a deep insight into the basic mechanism that leads to the harmonic generation. Recently, we have demonstrated the ability to resolve the first stage of the process-field induced tunnel ionization-by adding a weak perturbation to the strong fundamental field. Here we generalize this approach and show that the assumptions behind the strong field approximation are valid over a wide range of tunnel ionization conditions. Performing a systematic study-modifying the fundamental wavelength, intensity and atomic system-we observed a good agreement with quantum path analysis over a range of Keldysh parameters. The generality of this scheme opens new perspectives in high harmonics spectroscopy, holding the potential of probing large, complex molecular systems. (literal)

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