Observation of Coulomb focusing in tunnelling ionization of noble gases

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DOIResolve DOI: http://doi.org/10.1088/0953-4075/38/12/008
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TypeArticle
Journal titleJournal Of Physics B: Atomic, Molecular And Optical Physics
ISSN0953-4075
Volume38
Issue12
Pages19231933; # of pages: 11
AbstractWe ionized He, Ne and Ar in the tunnelling regime with a linearly polarized laser pulse and measured the ion-recoil momentum distribution on an axis perpendicular to laser polarization for two different wavelengths (l = 800 nm and l = 1800 nm). We observed a significantly narrower distribution for 800 nm than for 1800 nm. Classical simulations of the electron wave packet's evolution under the combined influence of the ion's Coulomb potential and the laser field show that the narrowing is caused by Coulomb focusing of the electron wave packet during recollisions. The narrowing is sensitive on the longitudinal momentum of the wave packet after tunnelling, which suggests a way of measuring it. Measurements at 800 nm in circular polarization-for which no recollision occurs-do not exhibit this narrowing of the perpendicular momentum distribution. Simulations for circular polarization show another aspect of Coulomb focusing: the Coulomb potential also affects the wave packet's transverse momentum as it leaves the saddle point immediately after tunnelling.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
Identifier10436327
NPARC number12339011
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Record identifier3275b2fc-8c47-46e4-85e1-3df74d34c6f0
Record created2009-09-11
Record modified2016-05-09
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