Hamburg 2001 – scientific programme
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O: Oberflächenphysik
O 25: Postersitzung (Grenzfl
äche fest-flüssig, Methodisches, Nanostrukturen, Organische Dünnschichten, Rastersondentechniken, reine Oberfl
ächen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie, Sonstiges)
O 25.24: Poster
Wednesday, March 28, 2001, 15:00–18:00, Foyer zu B
On the competition of α and β phase in PTCDA on Ag(111) — •B. Krause1, A. Dürr1, K. Ritley1, F. Schreiber1,2, H. Dosch1,2, and D. M. Smilgies3 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, D-70569 Stuttgart — 2Institut für Theoretische und Angewandte Physik, Universität Stuttgart, D-70550 Stuttgart — 3Cornell University, CHESS, Ithaca, NY 14853, USA
The structure of PTCDA (3,4,9,10-perylene-tetracarboxylic dianhydride) grown epitaxially on Ag(111) substrates has been studied using in-situ grazing incidence X-ray diffraction (GIXD) for different growth conditions. An extensive map of reciprocal space has been measured with 31 Bragg reflections. A pronounced splitting of certain reflections is found both in-plane as well as out-of-plane, providing evidence for a coexistence of the α and the β phase. The competition of the two polymorphs is discussed in terms of the influence of epitaxial strain, thickness, and growth temperature.