Abstract.
We report a new approach to intense-field photoionization that is based on the ad hoc assumption that m photons of energy \(E_{\rm ph}\) arriving within a typical electronic response time are effectively equivalent to a single photon of energy \(mE_{\rm ph}\). The heuristic model contains no adjustable parameters and unifies apparent multiphoton and field aspects. Moreover, nonsequential, suppressed and above-threshold ionization phenomena become readily understandable. Predicted ionization intensities are in satisfactory agreement with available experimental data ranging from C6H6 to Ne3 + , from femtosecond to nanosecond laser pulses, and from ultraviolet to infrared laser radiation.
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Received: 20 January 2004, Published online: 17 August 2004
PACS:
32.80.Rm Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states) - 32.80.Wr Other multiphoton processes - 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift
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Uiterwaal, C.J.G.J., Gebhardt, C.R., Schröder, H. et al. Predicting intense-field photoionization of atoms and molecules from their linear photoabsorption spectra in the ionization continuum. Eur. Phys. J. D 30, 379–392 (2004). https://doi.org/10.1140/epjd/e2004-00102-7
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DOI: https://doi.org/10.1140/epjd/e2004-00102-7