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MO: Fachverband Molekülphysik

MO 12: Femtosecond Spectroscopy III

MO 12.4: Hauptvortrag

Dienstag, 19. März 2013, 15:00–15:30, F 102

Photoelectron angular distributions of chiral molecules from multi-photon ionization — •Matthias Wollenhaupt, Christian Lux, Vanessa Brandenstein, Cristian Sarpe, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

Photoelectron Circular Dichroism (PECD) [1] was previously investigated on small chiral molecules using synchrotron radiation. The observed asymmetries in the PECD arise in forward/backward direction with respect to the light propagation. Recently, we have demonstrated a circular dichroism effect in the plus/minus ten percent regime derived from images of photoelectron angular distributions resulting from 2+1 REMPI of randomly oriented chiral molecules in the gas phase, where Camphor and Fenchone were chosen as prototypes [2]. The PECD was also observed in the Above Threshold Ionization (ATI) photoelectrons. Currently, we study nuclear and electron dynamics on the intermediate resonance with the help coherent control techniques [3]. In addition, 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 [4]. On atoms we have demonstrated the creation of designer electron wave packets using polarization shaped laser pulses.

[1] I. Powis, in Adv. Chem. Phys. 138, 267 (2008).

[2] C. Lux et al., Angew. Chem. Int. Ed. 51, 5001 (2012).

[3] M. Wollenhaupt and T. Baumert, Faraday Discuss. 153, 9, (2011).

[4] M. Wollenhaupt et al., Appl. Phys. B 95, 647, (2009).