Strong-field non-sequential double ionization: wavelength dependence of ion momentum distributions for neon and argon

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Title Strong-field non-sequential double ionization: wavelength dependence of ion momentum distributions for neon and argon
Author Alnaser, A.S.; Comtois, D.; Hasan, A.T.; Villenueve, D.M.; Kieffer, J.C.; Litvinyuk, Igor
Journal Name Journal of Physics B - Atomic, Molecular and Optical Physics
Year Published 2008
Place of publication Bristol, England
Publisher IOP Publishin
Abstract Strong-field double ionization of atoms in a non-sequential regime produces longitudinal ion momentum distributions with a characteristic double-peak structure. At 800 nm laser wavelength in Ne2+ the structure is very pronounced with a well-resolved dip at zero momentum, while for Ar2+ the dip is very shallow, possibly indicating different mechanisms in the two atoms. We investigated the source of this difference by measuring longitudinal momentum distributions of Ne2+ and Ar2+ ions at different laser wavelengths (485, 800, 1313 and 2000 nm) and intensities. The shapes of the experimental momentum distributions for the two atoms exhibit strong dependence on laser wavelength: for both the dip becomes more pronounced at longer wavelengths. At 1300 nm the longitudinal momentum spectrum for Ar2+ is similar to that of Ne2+ at 800 nm. On the other hand, the Ne2+ spectrum measured at 485 nm has the same shape as that of Ar2+ at 800 nm. This observation indicates that the difference between Ne and Ar observed at 800 nm should not be attributed solely to differences in relative electron impact ionization and excitation cross-sections of the two atoms. It is, to a larger extent, due to the interplay between the ponderomotive energy of electron and the ionization potentials of the target atom.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1088/0953-4075/41/3/031001
Volume 41
Issue Number 3
Page from 031001-1
Page to 031001-5
ISSN 0953-4075
Date Accessioned 2010-08-02
Date Available 2011-05-03T04:46:25Z
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Atomic and Molecular Physics
URI http://hdl.handle.net/10072/38497
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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