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Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Nanostructures at Surfaces 2

O 13.7: Vortrag

Montag, 5. September 2022, 16:30–16:45, S052

Elucidating the chirality of polycrystalline films with fundamental and SHG-CD — •Kevin Liang1, Florian Ristow2, Jakob Scheffel2, Natalie Fehn1, Reinhard Kienberger2, Ueli Heiz1, Aras Kartouzian1, and Hristo Iglev21Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich — 2Physics Department E11, Technical University of Munich

Preferential desorption of enantiomers of 1,1'-Bi-2-naphthol (BINOL) has been observed, depending on the handedness of circularly polarised light, which is of interest for enantioenrichment processes. Therefore, characterisation of the enantiomeric excess of the sample and the understanding of its chirality is key. However, that requires further studies and greater clarification to be carried out and obtained, respectively. This contribution discusses the optical properties of BINOL thin films with fundamental and second harmonic generation (SHG) circular dichroism spectroscopy (CD) with different sample preparation methods, enantiomeric compositions and under varying experimental conditions. Depending on the previous conditions mentioned, the observed CD and anisotropy (g) value can be even of opposite sign for the same thin film.

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