Low-energy structures in strong field ionization revealed by quantum orbits

Experiments on atoms in intense laser pulses and the corresponding exact ab initio solutions of the time-dependent Schrödinger equation (TDSE) yield photoelectron spectra with low-energy features that are not reproduced by the otherwise successful work horse of strong field laser physics: the "...

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Bibliographic Details
Published in:Physical review letters 2010-12, Vol.105 (25), p.253002-253002, Article 253002
Main Authors: Yan, Tian-Min, Popruzhenko, S V, Vrakking, M J J, Bauer, D
Format: Article
Language:English
Subjects:
APPROXIMATIONS
ATOMIC AND MOLECULAR PHYSICS
ATOMS
CALCULATION METHODS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIFFERENTIAL EQUATIONS
ELECTRON SPECTROSCOPY
EQUATIONS
INCLUSIONS
IONIZATION
LASERS
MATHEMATICAL SOLUTIONS
ORBITS
PARTIAL DIFFERENTIAL EQUATIONS
PHOTOELECTRON SPECTROSCOPY
PULSES
SCHROEDINGER EQUATION
SEMICLASSICAL APPROXIMATION
SPECTROSCOPY
TIME DEPENDENCE
TRAJECTORIES
WAVE EQUATIONS
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Summary:Experiments on atoms in intense laser pulses and the corresponding exact ab initio solutions of the time-dependent Schrödinger equation (TDSE) yield photoelectron spectra with low-energy features that are not reproduced by the otherwise successful work horse of strong field laser physics: the "strong field approximation" (SFA). In the semiclassical limit, the SFA possesses an appealing interpretation in terms of interfering quantum trajectories. It is shown that a conceptually simple extension towards the inclusion of Coulomb effects yields very good agreement with exact TDSE results. Moreover, the Coulomb quantum orbits allow for a physically intuitive interpretation and detailed analysis of all low-energy features in the semiclassical regime, in particular, the recently discovered "low-energy structure" [C. I. Blaga, Nature Phys. 5, 335 (2009) and W. Quan, Phys. Rev. Lett. 103, 093001 (2009).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.253002