Origin of Unexpected Low Energy Structure in Photoelectron Spectra Induced by Midinfrared Strong Laser Fields

Journal Article · Fri Sep 10 04:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.113003· OSTI ID:21466947

Chengpu, Liu; Hatsagortsyan, Karen Z ^[1]

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1. Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany)

Using a semiclassical model which incorporates tunneling and Coulomb field effects, the origin of the low-energy structure (LES) in the above-threshold ionization spectrum observed in recent experiments [Blaga et al., Nature Phys. 5, 335 (2009); Quan et al., Phys. Rev. Lett. 103, 093001 (2009).] is identified. We show that the LES arises due to an interplay between multiple forward scattering of an ionized electron and the electron momentum disturbance by the Coulomb field immediately after the ionization. The multiple forward scattering is mainly responsible for the appearance of LES, while the initial disturbance mainly determines the position of the LES peaks. The scaling laws for the LES parameters, such as the contrast ratio and the maximal energy, versus the laser intensity and wavelength are deduced.

• OSTI ID: 21466947
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 105; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
CALCULATION METHODS
COULOMB FIELD
DISTURBANCES
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTRA
ELECTRON SPECTROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
IONIZATION
LASER RADIATION
LEPTONS
MULTIPLE SCATTERING
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
SCALING LAWS
SCATTERING
SEMICLASSICAL APPROXIMATION
SPECTRA
SPECTROSCOPY
TUNNEL EFFECT