High-order above-threshold ionization of argon: Plateau resonances and the Floquet quasienergy spectrum

R. M. Potvliege and Svetlana Vučić
Phys. Rev. A 74, 023412 – Published 31 August 2006

Abstract

The Floquet quasienergy spectrum of argon in a strong laser field of 800 nm wavelength is calculated for intensities up to 7×1013Wcm2, and beyond for some states, using a discrete complex basis set. Many of the dressed excited states of interest shift nonponderomotively in complicated ways but keep an ionization width narrow enough to produce sharp enhancements of above-threshold ionization (ATI) through Stark-shift-induced resonances. The quasienergy map is compared to high-resolution ATI spectra for 120fs Ti:sapphire pulses [Nandor et al., Phys. Rev. A 60, R1771 (1999)]. The plateau enhancements happen at intensities where the dressed ground state is in resonance or in the wing of resonances with dressed excited states. The resonant dressed states are identified. In many cases, the same state is responsible for an enhancement of ATI in the low as well as the high orders. No evidence is found for enhancements that are not concomitant with any curve crossing and could thereby be interpreted as channel-closing enhancement.

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  • Received 18 May 2006

DOI:https://doi.org/10.1103/PhysRevA.74.023412

©2006 American Physical Society

Authors & Affiliations

R. M. Potvliege

  • Department of Physics, Durham University, Durham DH1 3LE, United Kingdom

Svetlana Vučić

  • Institute of Physics, Pregrevica 118, 11080 Belgrade-Zemun, Serbia

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Issue

Vol. 74, Iss. 2 — August 2006

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