Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy
MO 12.12: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG1
Probing the anisotropic electronic structure of silicon cluster cations — •Marko Förstel, Bertram Jaeger, Philipp Sporkhorst, and Otto Dopfer — Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, D-10623 Berlin
Silicon is among the ten most abundant elements in our universe. In its ionic form it was found in the interstellar medium and even in the Earth’s atmosphere. The Si+ ion also plays a role in manufacturing processes of silicon based semiconductors. Here we set out to study the hitherto poorly understood fundamental chemistry and behavior of Sin+ ions.
A recently updated tandem mass spectrometer coupled with a laser vaporization source [1] is utilized to study the molecular structure of Sin+-Arm cluster ions. Depending on cluster source conditions, we observe magic numbers in these systems that indicate structures which are strongly influenced by the anisotropic electron density of the central Sin+ ion. We describe the updated setup, present the experimental mass spectra and discuss the possible cluster structures underlying these magic numbers. Our discussion is supported by quantum chemical calculations.
[1] Photodissociation spectrum and structure of Au4+ -H2O clusters, Jaeger, B. K. A., Savoca, M., Dopfer, O., and Truong, N. X., International Journal of Mass Spectrometry (402) 2016.