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MO: Fachverband Molekülphysik

MO 12: Femtosecond Spectroscopy III

MO 12.8: Vortrag

Mittwoch, 16. März 2011, 12:15–12:30, TOE 317

Fragmentation studies of chiral molecules via femtosecond-laser mass spectrometry — •Christian Lux, Vanessa Brandenstein, Cristian Sarpe, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D–34132 Kassel, Germany

Under symmetrical conditions two enantiomers of a chiral molecule that are non superimposable mirror images of each other show almost the same physical properties. In the recent past the analysis of enantiomers based on laser irradiation using circular polarized ultrashort-laser pulses was realized for many chiral molecules.
In this contribution we investigate the effect of Circular Dichroism (CD) on the ion yields [1-4] of low-volatile chiral molecules employing femtosecond laser pulses.
CD refers to the difference between absorption of left- and right-circularly polarized light for one enantiomer and shows a specific anisotropy. Using infrared circularly-polarized laser pulses and a Wiley-McLaren time-of-flight mass spectrometer we study differences in the anisotropy of Parent-Ions and their fragments with respect to the process of Multi-Photon-Ionization-Dissociation.
As test specimen in our first experimental investigations we use the enantiomers of limonene, camphor and fenchone.
[1] U. Boesl et al., Chem. Phys. Chem. 7: 2085-2087 (2006)
[2] A. Bornschlegel et al., Chem. Phys. Lett. 447: 187-191 (2007)
[3] H. G. Breuning et al., Chem. Phys. Chem. 10: 1199-1202 (2009)
[4] C. Logé et al., Anal. Bioanal. Chem. 395: 1631-1639 (2009)