A detailed analysis of the photoemission spectra of basic thioaromatic monolayers on noble metal substrates |
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Authors: | A. Shaporenko A. Terfort M. Grunze M. Zharnikov |
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Affiliation: | 1. Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany;2. Anorganische und Angewandte Chemie, Universität Hamburg, 20146 Hamburg, Germany |
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Abstract: | Analysis of photoemission spectra of complex thioaromatic self-assembled monolayers (SAMs) requires the knowledge and understanding of such spectra for the basic systems. Keeping this goal in mind, synchrotron-based high-resolution X-ray photoelectron spectroscopy was used to characterize SAMs formed from the simplest thioaromatic compounds, namely thiophenol, 1,1′-biphenyl-4-thiol and 1,1′;4′,1″-terphenyl-4-thiol on evaporated Au(1 1 1) and Ag(1 1 1) substrates. The acquired S 2p and C 1s spectra were analyzed in terms of fine structure and initial and final state effects in the photoemission process. The assignment of the individual spectral features was considered in detail. Conclusions on quality and chemical and structural homogeneity of the investigated SAMs were derived. |
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Keywords: | Self-assembled monolayers High-resolution X-ray photoelectron spectroscopy Initial and final state effects in the photoemission |
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