Spectroscopy of Occupied and Unoccupied States in Bio-Molecular Layers

• Main Author: Seifert, Stefan
• Other Authors: Gavrila, Gianina N.
• Format: Dissertation
• Language: English
• Published: 2006
• Subjects: info:eu-repo/classification/ddc/500; ddc:500; NEXAFS; Photoemission; DNA base; adenine; core level; cytosine; guanine; molecular orientation; valence band
• Online Access: http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601795; https://monarch.qucosa.de/id/qucosa%3A18617; https://monarch.qucosa.de/api/qucosa%3A18617/attachment/ATT-0/; https://monarch.qucosa.de/api/qucosa%3A18617/attachment/ATT-1/

The present thesis investigates the electronic and structural properties of adenine, cytosine, and guanine layers on hydrogen passivated silicon (111)(7x7). The (7x7) reconstruction of the silicon surface was achieved by direct current heating of the samples in UHV conditions. After in situ hydrogen passivation layers of the DNA bases were prepared in different thicknesses by means of organic molecular beam deposition, all samples were characterized employing valence band and core level photoemission spectroscopy. Additionally the near edge x-ray absorption fine structure of the DNA base layers was investigated. A detailed and consistent picture of structural and electronic properties of the nucleotide bases in the solid state could be developed by comparison of measurements and DFT/B3LYP calculations.