Regensburg 2004 – wissenschaftliches Programm
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O: Oberflächenphysik
O 18: Adsorption an Oberflächen I
O 18.7: Vortrag
Dienstag, 9. März 2004, 12:45–13:00, H38
Circular dichroism in core-level photoemission from butanediol on Si(100) — •JeongWon Kim1, Massimo Tallarida1, Hugo Dil1, Karsten Horn1, Marilena Carbone2, Maria Pia Casaletto3, Roberto Flammini4, and Maria Novella Piancastelli2 — 1Fritz-Haber-Institut der MPG, 14195 Berlin — 2Dip. Di Scienze e Tecnologie Chimiche, Universita Tor Vegata, 00133 Roma, Italia — 3Istituto per lo Studio di Materiali Nanostrutturati, CNR, I-90146 Palermo — 4Istituto di Metod. Inorganiche, 00016 Monterotondo
Molecules which possess a chiral center are of great importance in chemistry and biology. In search of a method to control enantioselectivity in chemical reactions, recent interest has turned to adsorbed chiral molecules. The detection of chirality in adsorbed molecules is difficult, however, having so far been mostly demonstrated in scanning tunnelling microscopy. Here we report on a study of an adsorbed chiral molecule, i.e. 2,3 butanediol on Si(100), using circular dichroism in core level photoemission. Butanediol is well suited for such studies since it contains two chemically different sets of carbon atoms, only one of which is in a chiral center. We observe clear dichroism in the carbon 1s emission signal from R,R and S,S butanediol. In our analysis of the results we aim at distinguishing between circular dichroism from the chiral center itself, and that induced by the chiral nature of the experimental geometry, through a comparison of dichroism observed under different experimental geometries, as well as by a comparison with data from the achiral enantiomer of butanediol.