| DOI | Resolve DOI: https://doi.org/10.1088/0953-4075/38/12/008 |
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| Author | Search for: Comtois, D.1; Search for: Zeidler, D.1; Search for: Pépin, H.; Search for: Kieffer, J. C.; Search for: Villeneuve, D. M.1; Search for: Corkum, P. B.1 |
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| Affiliation | - National Research Council Canada. NRC Steacie Institute for Molecular Sciences
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| Format | Text, Article |
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| Abstract | We 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. |
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| Publication date | 2005-06-06 |
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| Publisher | IOP Publishing |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 12339011 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 3275b2fc-8c47-46e4-85e1-3df74d34c6f0 |
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| Record created | 2009-09-11 |
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| Record modified | 2023-08-11 |
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