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DS: Fachverband Dünne Schichten
DS 10: Thin Film Characterisation: Structure Analysis and Composition (XRD, TEM, XPS, SIMS, RBS, ...) III
DS 10.5: Vortrag
Montag, 14. März 2011, 15:00–15:15, GER 38
Hard X-ray photoelectron spectroscopy studies of newly designed charge transfer salts at PETRA III. — •Andrei Gloskovskii1, Katerina Medjanik2, Sebastian Thiess3, Heiko Schulz-Ritter3, Wolfgang Drube3, Dennis Chercka4, Martin Baumgarten4, Klaus Müllen4, Claudia Felser1, and Gerd Schönhense2 — 1Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, Mainz — 2Institute of Physics, Johannes Gutenberg - University, Mainz — 3Hasylab/DESY, Hamburg — 4Max Planck Institute for Polymer Research, Mainz
The undulator beamline P09 of the PETRA III storage ring is in user operation since September 2010. The hard X-Ray photoelectron spectroscopy (HAXPES) end station is located 95 m from the source. Photoelectrons with up to 15 keV kinetic energy can be measured in different experimental geometries by means of a SPECS Phoibos 225 HV analyser. Thin films and microcrystals of the organic charge-transfer compounds tetra- /hexamethoxypyrene - tetracyanoquinodimethane (TMPx/HMPx-TCNQy in different stoichiometries) have been studied by HAXPES. The spectra of the HMPx-TCNQy compounds reveal two bonding states of oxygen, one of which stays fixed, but varies strongly in intensity and the other one is broadened and changes its energy position for x:y=2:1 microcrystals. This is an indication of the higher degree of charge transfer. The results correlate with previous investigations of the same systems using UPS/STS and NEXAFS. Funded by BMBF 05K10UMA, DFG/TR49, Graduate School of Excellence MAINZ, Centre of Complex Materials COMATT.