Regensburg 2010 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 41: Topical Session Growth Kinetics II

MM 41.1: Talk

Wednesday, March 24, 2010, 17:15–17:30, H4

Photoemission Electron Microscopy of the Temperature Dependent Pre-nucleation Dynamics of Sexiphenyl Molecules Deposited on Cu (110) — A J Fleming, F P Netzer, and •M G Ramsey — Surface and Interface Physics, Karl-Franzens Universität Graz, Universitätsplatz 5, 8010 Graz, Austria

The pre-nucleation dynamics of sexiphenyl (6P) molecules deposited in-situ on Cu (110) are investigated by photoemission electron microscopy (PEEM) in ultrahigh vacuum. PEEM, in threshold mode, is used to monitor precisely in real-time a) the amount deposited, b) layer filling by 6P molecules, c) dynamic surface density redistributions during layer filling and d) critical surface density spontaneously induced meta-stable layer de-wetting. It is by studying this crucial pre-nucleation deposition period that the requirements for critical nucleation of 6P, such as substrate commensurability, can be understood. A numerical simulation of PEEM image photoemission intensity variations with time is shown to help determine pre-nucleation layer filling mechanisms for various growth temperatures. Comparison with data previously obtained from static techniques, such as STM and NEXAFS, together with dynamic data from PEEM of 6P deposited on Cu (110) 2 x 1 * O [1] enable the 6P nucleation processes to be elucidated from PEEM.

[1] A J Fleming et al, J. Phys: Condens. Matter 21 (2009) 445003