Heidelberg 2015 – wissenschaftliches Programm
A 25.7: Vortrag
Mittwoch, 25. März 2015, 16:15–16:30, PH/SR106
Vibrationally resolved UV fluorescence of diamondoids — •Torbjörn Rander1, Robert Richter1, Tobias Zimmermann1, Andre Knecht1, Andrea Merli1, Christoph Heidrich1, Ramon Rahner1, Thomas Möller1, Merle I. S. Röhr2, Jens Petersen2, Roland Mitric2, Jeremy E. Dahl3, and Robert M. K. Carlson3 — 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Deutschland — 2Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Würzburg, Deutschland — 3Stanford Institute of Materials and Energy Sciences, Stanford University
Diamondoids are a class of perfectly size- and shape selectable carbon nanoparticles, with a wide range of interesting properties. Due to the size-selectivity afforded by the diamondoids, they are ideal model systems for studying the photo-physics of hydrocarbon molecules of different sizes. We present a study of the size- and shape dependent energy resolved UV fluorescence of diamondoids, ranging from adamantane to pentamantane, using narrow band laser light as excitation source.
We conclude that previous, relatively straightforward interpretations of the fluorescence spectra recorded using synchrotron light are incomplete, and that the additional fine-structure observed in the laser excited spectra can only be properly assigned by performing computations, in our case DFT and TD-DFT was deemed sufficient to accurately describe and understand the spectral envelopes of the different sized diamondoids. The approach employed is thought to generally be applicable also for other hydrocarbon molecules.