Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 34: Poster II
A 34.5: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Interference structure in photoelectron spectra of cluster-anions by double pulse excitation — •Raphael Kuhnen, Christof Bartels, Christian Hock, and Bernd von Issendorff — Universität Freiburg, physikalisches Institut, Stefan-Meier-Strasse 19, D-79104 Freiburg
Interference of free electron wave packets generated by femtosecond double pulses which detach the excess electron of anionic atoms and clusters is investigated. Pulse sequences have been shown to be a powerful tool to study interference effects in molecular and atomic systems and controll the quantum mechanical phase of the state1,2.
The experiment is done by one and two photon excitation with both parallel and perpendicular laser polarisation and an angle resolved photoelectron detection. In particular detaching the electron of the system via excitation of a resonant state offers a tool to study processes leading to decoherence of the system at ultra short timescales.
1 Bouchene et al., Eur. Phys. J. D, 2, 131 (1998)
2 Wollenhaupt et al., Phys. Rev. A, 68, 015401 (2003)