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A: Fachverband Atomphysik

A 1: Attosecond electron dynamics

A 1.5: Talk

Monday, March 10, 2008, 15:15–15:30, 3C

Imaging Attosecond Electron Wavepackets Around The Ionization Threshold — •Marko Swoboda¹, Thomas Remetter¹, Johan Mauritsson¹, Anne l’Huillier¹, Kenneth J. Schafer², Freek Kelkensberg³, Wing-Kiu Siu³, Per Johnsson³, Marc J. J. Vrakking³, Matthias F. Kling⁴, Irina Znakovskaya⁴, Thorsten Uphues⁴, Sergey Zherebtsov⁴, Franck Lépine⁵, Enrico Benedetti⁶, Federico Ferrari⁶, Giuseppe Sansone⁶, and Mauro Nisoli⁶ — ¹Dept. of Physics, LTH, Lund University, P.O. Box 118, 221 00 Lund, Sweden — ²Louisiana State Univ., Baton Rouge, Louisiana 70803-4001, USA — ³AMOLF Institute, P.O.Box 41883, 1009 DB Amsterdam, The Netherlands — ⁴MPI für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — ⁵Univ. Lyon 1; CNRS; LASIM, UMR 5579,43 bvd. du 11 nov. 1918, 69622 Villeurbanne, France — ⁶CUSBO, ULTRAS-INFM, Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

We image the momentum distributions of attosecond electron wavepackets generated from the ionization of Helium by attosecond XUV pulses. Using an infrared probing field, the evolution of these wavepackets can be captured in time and space. Tuning the central frequency of the pulses allows us to initiate a number of processes that originate from the interplay of partially bound and continuum wavepackets or returning electrons and the atomic potential. Using this attosecond pump-probe scheme, we can track electron dynamics around the ionization barrier, performing interferometric measurements of different ionization pathways.