Spectroscopy of Occupied and Unoccupied States in Bio-Molecular Layers

Spectroscopy of Occupied and Unoccupied States in Bio-Molecular Layers

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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 hyd...

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Bibliographic Details
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
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Summary: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.

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