Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.42: Poster
Mittwoch, 28. März 2012, 18:15–21:45, Poster B
Ultraviolet photoemission from ionic liquids — •Rebecca Pöschel and Thomas Fauster — Friedrich-Alexander Universität Erlangen, Lehrstuhl für Festkörperphysik, Staudtstr. 7, 91058 Erlangen, Germany
Room-temperature ionic liquids entirely consist of molecular ions. Due to their very low vapor pressure they can be used and studied under ultrahigh vacuum conditions on single-crystal surfaces.
In this study we used two ionic liquids containing the same cation 1-ethyl-3-methylimidazolium [EMIM]+ and two different anions bis(triflouromethylsulfonyl)amide [Tf2N]− and tetracyanoborate [TCB]−. Films of different thicknesses between 0.3 and 20 monolayers were deposited on a well-defined Cu (100) single-crystal surface via evaporation. The samples were measured by vacuum ultraviolet (VUV) photoelectron spectroscopy (21.2 eV) under normal emission. The molecular orbitals were studied as a function of layer thickness and a strong radiation damage was observed.