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O: Fachverband Oberflächenphysik

O 71: Scanning Probe Techniques and New Experimental Methods

O 71.14: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Laser desorption of chiral molecules — •Farinaz Mortaheb, Joern Lepelmeier, Kerstin Wachinger, Aras Kartouzian, Ulrich Boesl, and Ulrich Heiz — Chair of Physical Chemistry, Lichtenbergstraße 4, 85748 Garching

Laser desorption enables the vaporization of non-volatile and thermally unstable molecules without fragmentation and thus allows to analyze large bio- and organic molecules in the gas phase. Desorbed molecules can be analyzed mass spectroscopically by REMPI-ToF, which can be combined readily with circular dichroism to investigate the chiroptical properties of non-volatile chiral molecules in the gas phase without any interference from solvent molecules (as in solutions) or diastereomeric partner molecules. Using the example of Binol, and a prototype experimental apparatus, an optimized sample preparation recipe was found to optimize the laser desorption yield of neutral molecules. The high signal intensity and stability attained in our lab pave the way for further experiments using a purpose designed setup.