Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Posters 4: Novelties in Molecular Physics

MO 21.2: Poster

Thursday, March 26, 2015, 17:00–19:00, C/Foyer

Structural rearrangement by an IR excitation in isolated hydroxychromones — •Anke Stamm, Martin Weiler, Kirsten Schwing, and Markus Gerhards — TU Kaiserslautern, Fachbereich Chemie, Physikalische und Theoretische Chemie, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern

Photochemical reactions as the excited state proton transfer are of great interest due to their importance in chemical and biological processes. Molecular beam investigations combined with double, triple and quadruple resonance IR/UV spectroscopic techniques are very powerful tools to analyze structures and photochemically induced reactions. In comparison with (TD)-DFT calculations direct structural information on the electronic ground and electronically excited state of isolated molecules and clusters are obtained. Here we present studies on the photochemically reactive 3-hydroxychromone and 3-hydroxyflavone as well as clusters with water. In order to analyze structures and proton transfer reactions of different isomers/species with overlapping UV transitions in different electronic states, the quadruple resonance methods yield unambiguous results. Furthermore in a new approach for neutral isolated clusters IR/IR/UV/UV spectra indicate that the first IR excitation can lead to a rearrangement reaction of a cluster which is analyzed by the second IR excitation in combination with a resonant two photon ionization.