Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Poster: Femtosecond Spectroscopy

MO 7.8: Poster

Dienstag, 9. März 2010, 16:00–18:30, Lichthof

Fragmentation studies of chiral molecules via femtosecond-laser mass spectrometry — •Christian Lux, Qingqing Liang, Cristian Sarpe-Tudoran, 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 femtosecond-laser pulses was realized for many chiral molecules. Circular dichroism (CD) refers to the difference between absorption of left- and right-circularly polarized light for one enantiomer. Absorption values for both enantiomers show a specific anisotropy. In this contribution we study the effect of CD on the ion yield of chiral molecules by mass specrometry via ultrashort laser pulses [1-3]. We used a home-build Wiley-McLaren time-of-flight mass spectrometer and infrared circularly-polarized femtosecond-laser pulses to measure the intensity dependence of mass-spectra from low-volatile chiral substances in particular for the enantiomers of camphor.
[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)