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Molecular adsorption and growth of naphthalene films on Ag(1 0 0)
Authors:G. Tzvetkov,N. Schmidt,Ch. Wö  ll
Affiliation:a Physikalische Chemie II, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstrasse 3, D-91058 Erlangen, Germany
b Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany
Abstract:The adsorption of naphthalene, vacuum deposited on a Ag(1 0 0) surface, was comprehensively investigated by means of low-energy electron diffraction (LEED), temperature-programmed thermal desorption (TPD) spectroscopy, X-ray photoelectron spectroscopy (XPS), and polarization-dependent near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in the mono- and multilayer regime. A growth of long-range ordered monolayer at 140 K is observed with LEED. The polarization-dependent C 1s NEXAFS shows that the naphthalene molecules in the monolayer lie almost parallel to the Ag(1 0 0) surface. With increasing film thickness, the molecular orientation turns to upright position. Furthermore, NEXAFS measurements show that in the multilayer regime the molecular orientation depends on the substrate temperature during deposition.
Keywords:Adsorption   Near edge extended X-ray fine structure spectroscopy (NEXAFS)   Aromatics   Naphthalene
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