Adenine adlayers on Cu(111): XPS and NEXAFS study

Journal Article · Sat Nov 07 04:00:00 EST 2015 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4935055· OSTI ID:22493201

Tsud, Nataliya; Bercha, Sofiia; Ševčíková, Klára; Matolín, Vladimír ^[1]; Acres, Robert G. ^[2]; Prince, Kevin C. ^[2]

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1. Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 18000 Prague 8 (Czech Republic)
2. Elettra-Sincrotrone Trieste S.C.p.A., Area Science Park, Strada Statale 14, km 163.5, 34149 Basovizza, Trieste (Italy)

The adsorption of adenine on Cu(111) was studied by photoelectron and near edge x-ray absorption fine structure spectroscopy. Disordered molecular films were deposited by means of physical vapor deposition on the substrate at room temperature. Adenine chemisorbs on the Cu(111) surface with strong rehybridization of the molecular orbitals and the Cu 3d states. Annealing at 150 °C caused the desorption of weakly bonded molecules accompanied by formation of a short-range ordered molecular adlayer. The interface is characterized by the formation of new states in the valence band at 1.5, 7, and 9 eV. The present work complements and refines existing knowledge of adenine interaction with this surface. The coverage is not the main parameter that defines the adenine geometry and adsorption properties on Cu(111). Excess thermal energy can further rearrange the molecular adlayer and, independent of the initial coverage, the flat lying stable molecular adlayer is formed.

• OSTI ID: 22493201
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 17 Vol. 143; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ADENINES
ADSORPTION
ANNEALING
CHEMISORPTION
DEPOSITS
DESORPTION
FILMS
FINE STRUCTURE
INTERACTIONS
INTERFACES
MOLECULES
PHYSICAL VAPOR DEPOSITION
SUBSTRATES
SURFACES
TEMPERATURE RANGE 0273-0400 K
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY