Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.12: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Circular dichroism in the photoelectron distribution from multiphoton ionization of chiral molecules — •Ingo Dreissigacker and Manfred Lein — Institut für Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany

Circular dichroism in the photoelectron angular distribution from chiral molecules illuminated with XUV radiation has been predicted [1] and measured [2] long ago. For application in chemical analytics, however, methods based on table-top laser systems and thus longer wavelengths would be preferable, since XUV sources are rarely available. In contrast to the dichroism effect in the photoelectron distribution from single-photon ionization, dichroism in multiphoton ionization has been proven experimentally only recently [3].

Motivated by this progress, we investigate the asymmetry in the electron distribution from chiral molecules theoretically with the help of the strong-field approximation. We calculate photoelectron spectra for randomly oriented camphor and fenchone molecules. The initial bound states required for the integration are obtained from quantum chemistry calculations. We compare our results to the experimental findings of [3] and investigate the dependence of the dichroism on various laser parameters.

[1] N. A. Cherepkov, Chem. Phys. Lett. 87, 344 (1982)

[2] N. Böwering et al., Phys. Rev. Lett. 86, 1187 (2001)

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