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A: Fachverband Atomphysik

A 28: Attosecond Physics II / Interaction with Strong or Short Laser Pulses III

A 28.4: Vortrag

Freitag, 12. März 2010, 14:45–15:00, F 107

Attosecond Transient Absorption Spectroscopy — •Adrian Wirth¹, Eleftherios Goulielmakis¹, Zhi-Heng Loh², Robin Santra³, Nina Rohringer⁴, Vladislav S. Yakovlev⁵, Sergey Zherebtsov¹, Thomas Pfeifer², Abdallah M. Azzeer⁶, Matthias F. Kling¹, Stephen R. Leone², and Ferenc Krausz^1,5 — ¹Max-Planck-Institut für Quantenoptik, Garching, Germany — ²Departments of Chemistry and Physics, University of California, Berkeley, USA — ³Department of Physics, University of Chicago, Chicago, USA — ⁴Lawrence Livermore National Laboratory, Livermore, USA — ⁵Department für Physik, Ludwig-Maximilians-Universität, Garching, Germany — ⁶Physics and Astronomy Department, King Saud University, Kingdom of Saudi Arabia

The electronvolt-scale energy spacing of quantum states in the valence shell of atoms and molecules implies electron motion which unfolds in the range of a few tens of attoseconds to a few femtoseconds. Efforts of accessing those ultrafast dynamics comprise the generation of isolated soft-x-ray attosecond pulses and the control of light fields. We show that a combination of attosecond technology and x-ray absorption spectroscopy is able to further expand the horizon of attosecond science. This opens the door for gaining direct, time-domain insight into quantum coherences and connected electron density motion in the valence shell of atoms and molecules. In a proof-of-principle experiment we traced for the first time valence electron motion in Kr ions in real time and could completely reconstruct the strong-field initiated spin-orbit wavepacket coherence and quantum level population.