Dresden 2009 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: POSTERS Colloids and Liquids
CPP 39.31: Poster
Thursday, March 26, 2009, 17:00–19:30, P3
Changes of the Near-Surface Chemical Composition of the [EMIM]Tf2N Room Temperature Ionic Liquid under the Influence of Irradiation — •Angela Keppler1, Marcel Marschewski2, Marcel Himmerlich1, Syed Imad-Uddin Ahmed1, Juergen A. Schaefer1, Evgenij Pachomow2, Wolfgang Maus-Friedrichs2, Oliver Höfft3, Frank Endres3, and Stefan Krischok1 — 1Institut für Physik and Institut für Mikro- und Nanotechnologien, TU Ilmenau, P.O. Box 100565, 98684 Ilmenau, Germany — 2Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld, Germany — 3Institut für Mechanische Verfahrenstechnik, TU Clausthal, Robert-Koch-Str. 42, 38678 Clausthal-Zellerfeld, Germany
In some applications room temperature Ionic Liquids (RT-ILs) are exposed to different kinds of irradiation. Using the low vapour pressures of RT-ILs, we studied the influence of irradiation on the surface properties under UHV conditions by photoelectron spectroscopy and Metastable Induced Electron Spectroscopy. We present the effect of irradiation by electrons and photons with energies ranging from a few eV to several keV on the surface composition of [EMIM]Tf2N and its valence band structure. Our results indicate a strong reduction of the carbon content during keV-electron irradiation as well as other compositional changes. The changes of the film composition are correlated with changes in the valence band structure as a function of irradiation energy. X-ray irradiation with high exposures cause also variations in chemical composition of the [EMIM]Tf2N.