Skip to main content

Research Repository

Advanced Search

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

Potvliege, R.M.; Vucic, S.

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


Authors

S. Vucic



Abstract

The Floquet quasienergy spectrum of argon in a strong laser field of 800 nm wavelength is calculated for intensities up to 7×1013 W cm–2, 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 120 fs 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.

Journal Article Type Article
Publication Date 2006-08
Deposit Date Feb 12, 2007
Publicly Available Date Sep 20, 2010
Journal Physical Review A
Print ISSN 1050-2947
Electronic ISSN 1094-1622
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 74
Issue 2
DOI https://doi.org/10.1103/physreva.74.023412
Keywords MULTIPHOTON PROCESSES; HARMONIC-GENERATION; ATOMIC-HYDROGEN; LASERFIELD; 248 NM; ENHANCEMENT; STATES; TIME; DYNAMICS; HELIUM
Public URL https://durham-repository.worktribe.com/output/1582434

Files

Published Journal Article (513 Kb)
PDF

Copyright Statement
© 2006 by The American Physical Society. All rights reserved.






You might also like



Downloadable Citations