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Prof. Dr. Matthias Wollenhaupt, Christian Lux, Dr. Marc Krug and Prof. Dr. Thomas Baumert Cover Picture: Tomographic Reconstruction of Designer Free-Electron Wave Packets (ChemPhysChem 7/2013) ChemPhysChem 14

Article first published online: 29 APR 2013 | DOI: 10.1002/cphc.201390031

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Designer electron wave packets are created by multiphoton ionization of potassium atoms employing polarization-shaped femtosecond laser pulses, as reviewed on p. 1341 by M. Wollenhaupt et al. In order to reconstruct the three-dimensional photoelectron momentum distribution, we use a velocity-map imaging spectrometer to measure multiple projections at different angles by rotating the pulse with a l/2 plate. This procedure is illustrated for elliptically polarized light in the lower row. The images along the arrows (top left) show the evolution of measured projections towards a prescribed target (T) during an iterative optimization of the polarization-shaped pulse.

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