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Title: Direct XUV Probing of Attosecond Electron Recollision

Abstract

We demonstrate that the recolliding electron wave packet, fundamental to many strong field phenomena, can be directly imaged with sub-A spatial and attosecond temporal resolution using attosecond extreme ultraviolet (XUV) pulses. When the recolliding electron revisits the parent ion, it can absorb an XUV photon yielding high energy electron and thereby providing a measurement of the electron energy at the moment of recollision. The full temporal evolution of the recollision wave packet can be reconstructed by measuring the photoelectron spectra for different time delays between the driving laser and the attosecond XUV probe. The strength of the photoelectron signal can be used to characterize the spatial distribution of the electron density in the longitudinal direction. Elliptical polarization can be used to characterize the electron probability in transversal direction.

Authors:
;  [1];  [2]
  1. Steacie Institute for Molecular Science, National Research Council of Canada, Ottawa, Ontario, K1A 0R6 (Canada)
  2. Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, M5S 3H6 (Canada)
Publication Date:
OSTI Identifier:
20951122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 12; Other Information: DOI: 10.1103/PhysRevLett.98.123001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRON DENSITY; ELECTRONS; EVOLUTION; EXTREME ULTRAVIOLET RADIATION; LASERS; PHOTOELECTRON SPECTROSCOPY; PHOTONS; POLARIZATION; PROBABILITY; PULSES; RESOLUTION; SPATIAL DISTRIBUTION; TIME DELAY; WAVE PACKETS

Citation Formats

Smirnova, Olga, Patchkovskii, Sergei, and Spanner, Michael. Direct XUV Probing of Attosecond Electron Recollision. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.123001.
Smirnova, Olga, Patchkovskii, Sergei, & Spanner, Michael. Direct XUV Probing of Attosecond Electron Recollision. United States. doi:10.1103/PHYSREVLETT.98.123001.
Smirnova, Olga, Patchkovskii, Sergei, and Spanner, Michael. Fri . "Direct XUV Probing of Attosecond Electron Recollision". United States. doi:10.1103/PHYSREVLETT.98.123001.
@article{osti_20951122,
title = {Direct XUV Probing of Attosecond Electron Recollision},
author = {Smirnova, Olga and Patchkovskii, Sergei and Spanner, Michael},
abstractNote = {We demonstrate that the recolliding electron wave packet, fundamental to many strong field phenomena, can be directly imaged with sub-A spatial and attosecond temporal resolution using attosecond extreme ultraviolet (XUV) pulses. When the recolliding electron revisits the parent ion, it can absorb an XUV photon yielding high energy electron and thereby providing a measurement of the electron energy at the moment of recollision. The full temporal evolution of the recollision wave packet can be reconstructed by measuring the photoelectron spectra for different time delays between the driving laser and the attosecond XUV probe. The strength of the photoelectron signal can be used to characterize the spatial distribution of the electron density in the longitudinal direction. Elliptical polarization can be used to characterize the electron probability in transversal direction.},
doi = {10.1103/PHYSREVLETT.98.123001},
journal = {Physical Review Letters},
number = 12,
volume = 98,
place = {United States},
year = {Fri Mar 23 00:00:00 EDT 2007},
month = {Fri Mar 23 00:00:00 EDT 2007}
}
  • Recent experimental developments of high-intensity, short-pulse extreme ultraviolet light sources are enhancing our ability to study electron-electron correlations. We perform time-dependent calculations to investigate the so-called 'sequential' regime ((Planck constant/2pi)omega>54.4 eV) in the two-photon double ionization of helium. We show that attosecond pulses allow us not only to probe but also to induce angular and energy correlations of the emitted electrons. The final momentum distribution reveals regions dominated by the Wannier ridge breakup scenario and by postcollision interaction.
  • An attosecond ionization gating is achieved using a few-cycle laser pulse in combination with its second harmonic. With this gating, the generation of the electron wave packet (EWP) is coherently controlled, and an isolated EWP of about 270 as is generated. An isolated broadband attosecond extreme ultraviolet pulse with a bandwidth of about 75 eV can also be generated using this gating, which can be used for EWP measurements as efficiently as a 50-as pulse, allowing one to measure a wide range of ultrafast dynamics not normally accessible before.
  • We examine the attosecond electron recollision dissociation of D{sub 2}{sup +} recently demonstrated experimentally [H. Niikura et al., Nature (London) 421, 826 (2003)] from a coherent control perspective. In this process, a strong laser field incident on D{sub 2} ionizes an electron, accelerates the electron in the laser field to eV energies, and then drives the electron to recollide with the parent ion, causing D{sub 2}{sup +} dissociation. A number of results are demonstrated. First, a full dimensional strong field approximation model is constructed and shown to be in agreement with the original experiment. This is then used to rigorouslymore » demonstrate that the experiment is an example of coherent pump-dump control. Second, extensions to bichromatic coherent control are proposed by considering dissociative recollision of molecules prepared in a coherent superposition of vibrational states. Third, by comparing the results to similar scenarios involving field-free attosecond scattering of independently prepared D{sub 2}{sup +} and electron wave packets, recollision dissociation is shown to provide an example of wave-packet coherent control of reactive scattering. Fourth, this analysis makes clear that it is the temporal correlations between the continuum electron and D{sub 2}{sup +} wave packet, and not entanglement, that are crucial for the subfemtosecond probing resolution demonstrated in the experiment. This result clarifies some misconceptions regarding the importance of entanglement in the recollision probing of D{sub 2}{sup +}. Finally, signatures of entanglement between the recollision electron and the atomic fragments, detectable via coincidence measurements, are identified.« less
  • No abstract prepared.