Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.2: Poster

Monday, March 23, 2015, 17:00–19:00, C/Foyer

Optical spectroscopy and structures of photo dissociated doped silicon clusters — •Bertram K.A. Jaeger, Janina Lebendig, Nguyen X. Truong, Andre Fielicke, and Otto Dopfer — IOAP, TU Berlin, Germany

Doped Si clusters with their great variety in physical and chemical properties are promising candidates for optoelectronics, sensors or medicine. We study the photodissociation of C, N and O doped Si clusters and compare the spectra with quantum chemical calculations. A laser vaporization source produces ionic clusters, which are then irradiated with a tunable visible laser in the range from 410 to 580 nm. Photo-induced dissociation of the cluster changes the mass spectrum, which is recorded by a reflectron time-of-flight mass spectrometer. Calculated absorption spectra are compared to experimental data to access geometric or electronic parameters. With the help of genetic and basin-hopping algorithms the most stable and low-energy isomers are identified. Results are to be verified by existing studies of IR-UV two color ionization of neutral and doped Si clusters [1]. The basic principle of the experimental setup is shown with pristine and Ar-tagged Au4+ clusters. [1] N.X. Truong et al., Phys. Chem. Chem. Phys., 2014, 16, 40, 22364-22372