Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Posters 3: Cluster, Strong Field Physics, and Experimental Techniques
MO 22.2: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Foyer LLM
Optical spectroscopy of small cluster cations — •Marko Förstel, Wolfgang Schewe, and Otto Dopfer — TU Berlin, IOAP, Hardenbergstr. 36, 10623 Berlin
Optical spectra of small cationic species are needed to understand the absorption properties of the interstellar medium. They also allow to understand the electronic structure of species relevant for catalysis and material science. Unfortunately, those spectra are not easy to obtain due to intrinsically low target densities.
In this poster presentation we introduce our new tandem quadrupole - reflectron time-of-flight spectrometer coupled to a laser vaporization source for the measurement of optical spectra of cluster cations.[1] Several improvements allow us to measure optical spectra detailed enough to enable structure determinations via comparisons to TD-DFT based Franck-Condon simulations.[2]
[1] M. Förstel, B. K. A. Jaeger, W. Schewe, P. H. A. Sporkhorst, O. Dopfer, Improved tandem mass spectrometer coupled to a laser vaporization cluster ion source, Rev. Sci. Instr. 2017, 88, 123110.
[2] M. Förstel, W. Schewe, O. Dopfer, Optical spectroscopy of the Au4+ cluster: Resolved vibronic structure indicates an unexpected iso- mer, submitted.