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

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...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2014-10, Vol.47 (20), p.204029-5
Main Authors: Soifer, H, Bruner, B D, Negro, M, Devetta, M, Faccialà, D, Vozzi, C, Silvestri, S de, Stagira, S, Dudovich, N
Format: Article
Language:English
Subjects:
Approximation
Atomic structure
attosecond spectroscopy
Dynamical systems
Dynamics
high harmonic generation
Ionization
ionization times
Mathematical analysis
mid-IR
Spectroscopy
tunnel ionization
Tunnels (transportation)
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Summary: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.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/47/20/204029