Franck-Condon Coupling in Anthracene Isomer Self-Assembled Layers and Symmetry Effects on the High Resolution Ultraviolet Photoemission Spectra

Franck-Condon coupling to the electronic structure of anthracene silane isomer complexes self-assembled on a silicon oxide surface has been measured by high-resolution photoelectron emission spectroscopy. Our results are in strong agreement with theoretical semiempirical calculations and gas phase measurements. The Franck-Condon vibronic fine structure observed in the high resolution photoemission spectra exhibits a strong dependence on the isomer, in particular, the anthracene functional group orientation with respect to the surface normal.