Abstract

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Coherent control of ultrafast electron dynamics

I-10

Coherent control of ultrafast electron dynamics


M. Wollenhaupt1*

1Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany

The ability to generate shaped ultrashort laser pulses of controllable envelope and instantaneous frequency with zeptosecond precision [1] has made it possible to manipulate the electron dynamics of quantum systems with unprecedented accuracy. In order to demonstrate three-dimensional control with polarization-shaped laser pulses we have developed a tomographic reconstruction method to measure the three-dimensional photoelectron angular distributions (PAD) in a Velocity Map Imaging (VMI) set-up. As an example, we have demonstrated the creation and manipulation of designer free-electron wave packets [2, 3]. In addition, we have shown how precision pulse shaping is used to manipulate the concerted electron and nuclear dynamics and selectively populate different bound electronic states in a molecule [4, 5]. Finally, we present a femtosecond laser-based approach to chiral recognition of randomly oriented chiral molecules in the gas phase. To this end, PAD resulting from REMPI of small chiral organic molecules are studied. The observed asymmetry in the PAD using left- and right-handed circularly polarized femtosecond laser pulses, i.e. the Photoelectron Circular Dichroism (PECD), is in the  ±  10 percent regime [6, 7].

(a) Creation of designer electron wave packets, (b) control of coupled electron / nuclear dynamics and (c) tomographic reconstruction of the PECD of Camphor.

(a) Creation of designer electron wave packets, (b) control of coupled electron / nuclear dynamics and (c) tomographic reconstruction of the PECD of Camphor.

References:

[1] J. Köhler, M. Wollenhaupt, T. Bayer et al., Opt. Express 19, 11638 (2011).

[2] M. Wollenhaupt, C. Lux, M. Krug et al., Chem. Phys. Chem. 14, 1341 (2013).

[3] P. Hockett, M. Wollenhaupt, C. Lux et al., Phys. Rev. Lett. 112, 223001 (2014).

[4] T. Bayer, H. Braun, C. Sarpe et al., Phys. Rev. Lett. 110, 123003 (2013).

[5] H. Braun, T. Bayer, C. Sarpe et al., J. Phys. B 47, 124015 (2014).

[6] C. Lux, M. Wollenhaupt, T. Bolze et al., Angew. Chem. Int. Ed. 51, 5001 (2012).

[7] C. Lux, M. Wollenhaupt, C. Sarpe et al., Chem. Phys. Chem. 16, 23 (2015).