Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Oberflächenphysik
O 53: Organische Dünnschichten V
O 53.8: Vortrag
Mittwoch, 9. März 2005, 12:30–12:45, TU EB420
Electron-vibron coupling in the NEXAFS spectra of naphthalene in the condensed and gas phase — •Dominique Hübner1, F. Holch1, A. Schöll1, R. Fink2, K.C. Prince3, S. Stranges4, and E. Umbach1 — 1Univ. Würzburg, Exp. Phys. II — 2Univ. Erlangen, Phys. Chem. II — 3Sincrotrone Trieste — 4CNR-Istituto di Metodologie Inorganiche e dei Plasmi
High-resolution NEXAFS spectroscopy is ideally suited to investigate the electronic structure of large organic molecules in both, the condensed and the gas phase. In ideal cases one observes distinct fine structures which are attributed to the coupling of electronic transitions to vibronic excitations [1]. We present NEXAFS data on naphthalene and deuterated naphthalene both in the gas and condensed phase. In order to identify vibronic modes, especially the C-H modes, in the electronic transitions deuterated naphthalene has been utitlized. In contrast to previous studies [1], a manifold of vibronic states efficiently couple to the core excitation which makes the analysis difficult.Comparison with benzene data sufficiently explain most of the structures. The differences between gas and condensed phase spectra are explained by Van-der-Waals like bonding in the condensed phase. The project is financed by BMBF (contracts 05 KS1 WWA5 and 05 KS4 WWC/2).
[1] A. Schöll et al. PRL 93, 146406 (2004)