Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Poster 1: Cluster, Femtosecond Spectroscopy
MO 14.32: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
Excitation Energy and Temperature Dependent Photoluminescence of Diamondoids — •Andre Knecht1, Robert Richter1, Torbjörn Rander1, Tobias Zimmermann1, Andrea Merli1, David Wolter1, Philipp Reiß2, Arno Ehresmann2, Peter Schreiner3, and Thomas Möller1 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin — 2Institut für Physik, Fachbereich Universität Kassel — 3Institut für Organische Chemie der Justus-Liebig-Universität Giessen
Diamondoids are perfectly mass and size selected, hydrogen passivated, sp3-hybridized nano-carbon-cages. Through chemical functionalization their optical luminescence and absorption properties can be influenced. Diamondoids have negative electron affinity and are of interest for electronic applications like self-assembeld monolayer as field emitters. We used synchrotron radiation to measure the fluorescence yield, absorption and luminescence spectra of samples like adamantane, 1-methyladamantane and(2,2*)-biadamantanyl. The compounds were brought into the gas phase using a heatable target cell. The luminescence spectra show vibronic transistions. To study the thermally inhomogeneous broading of the features and spectral congestion due to intramolecular vibrational redistribution, excitation energy and temperature-dependent measurements were performed. In addition, calculations on the density functional theory level were performed. We conclude that the excess energy provided by an absorbed photon is redistributed entirely before luminescence takes place. This technique allows us to probe caloric properties at a nanoscopic level.