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.
Original language | English |
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Article number | 204029 |
Number of pages | 5 |
Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |
Volume | 47 |
Issue number | 20 |
DOIs | |
State | Published - 28 Oct 2014 |
Keywords
- attosecond spectroscopy
- high harmonic generation
- ionization times
- mid-IR
- tunnel ionization
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics