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The ability to generate ultrashort laser pulses of controllable shape with sub-attosecond precision has made it possible to precisely manipulate the electron dynamics of quantum systems.
Recently, we have developed a tomographic reconstruction method to directly measure three-dimensional photoelectron angular distributions resulting from REMPI in a Velocity Map Imaging (VMI) set-up. On atoms we have demonstrated the creation of designer electron wave packets using polarization shaped laser pulses [1].
In another experiment, we show how precision pulse shaping is used to manipulate the coupled electron and nuclear dynamics in order to address different bound electronic target states in a molecule. In our two-color energy resolved photoelectron spectroscopy experiment an intense IR-pulse, the phase of which is tailored to the electronic wave packet oscillation, guides the system towards a preselected target channel [2].
Finally, a femtosecond laser based approach to chiral recognition of randomly oriented molecules in the gas phase enabling implementations in analytics is presented. PAD resulting from REMPI of camphor and fenchone molecules are studied in order to investigate the Circular Dichroism in the photo-ionization of chiral molecules. The observed circular dichroism effect using left- and right-handed circularly polarized femtosecond laser pulses is in the pm ten percent regime [3]
Literaturverzeichnis
[1] M. Wollenhaupt, C. Lux, M. Krug and T. Baumert, Tomographic Reconstruction of Designer Free-Electron Wave Packets, Chem. Phys. Chem., 14, 1341-1349 (2013).
[2] T. Bayer, H. Braun, C. Sarpe, R. Siemering, P. von den Hoff, R. de Vivie-Riedle, T. Baumert and M. Wollenhaupt, Charge oscillation controlled molecular excitation, Phys. Rev. Lett., 110, 123003 (2013).
[3] C. Lux, M. Wollenhaupt, T. Bolze, Q. Liang, J. Köhler, C. Sarpe and T. Baumert, Circular Dichroism in the Photoelectron Angular Distributions of Camphor and Fenchone from Multiphoton Ionization with Femtosecond Laser Pulses, Angew. Chem. Int. Ed., 51, 5001-5005 (2012).
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