Surface Chemistry of Ultrathin Films of Histidine on Gold As Probed by High-Resolution Synchrotron Photoemission

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Surface Chemistry of Ultrathin Films of Histidine on Gold As Probed by High-Resolution Synchrotron Photoemission

Zubavichus, Yan; Zharnikov, Michael; Yang, Yongjie; Fuchs, Oliver; Heske, Clemens; Umbach, Eberhard; Tzvetkov, George; Netzer, Falko P; Grunze, Michael

The journal of physical chemistry. B, 01/2005, Volume: 109, Issue: 2

Journal Article

Procedures for the vacuum deposition of thin histidine films on polycrystalline Au(111) and their characterization with high-resolution synchrotron-radiation-based photoelectron spectroscopy are reported. The chemical form of histidine (anionic vs zwitterionic) and the nature of its interactions with the substrate (strong ionic−covalent vs weak van der Waals bonding) in mono- and multilayer films are analyzed. It is shown that water adsorption on a pre-prepared histidine film at 100 K results in protonation of histidine molecules and partial formation of hydroxyl anions. These chemical effects are carefully differentiated from spectral changes associated with radiation damage of the histidine films.

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