Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 4: Electronic II

MO 4.4: Talk

Tuesday, March 15, 2022, 11:15–11:30, MO-H5

Formation and spectroscopic investigation of molecular clusters of phthalocyanine and water in superfluid helium nanodroplets — •Johannes Fischer and Alkwin Slenczka — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany

Superfluid helium nanodroplets serve as a gentle and ultracold (T = 0.37 K) host system for molecular and atomic species as well as weakly bound (van der Waals) clusters [1]. The latter can be synthesized in situ by successive pick-up of different species by the droplets. We will present an extended investigation of a cluster consisting of a single phthalocyanine and one water molecule, that possesses a multitude of isomeric structures in helium droplets [2]. The attachment of water to phthalocyanine becomes influential on spectroscopic observables like electronic and vibrational transition frequencies, line shapes, and intramolecular dynamics upon electronic excitation. This study discusses all these features by means of fluorescence excitation spectra and dispersed emission spectra. The number of configurational variants identified thereby provides evidence that for some of these cluster isomers the contribution of the surrounding helium goes beyond the stabilization of local minima in the phthalocyanine to water potential hypersurface. [1] A. F. Vilesov et al., Angew. Chem. Int. Ed., 43, 2622, (2004). [2] J. Fischer et al., J. Phys. Chem., 123, 10057, (2019).