J. Phys. Colloques
Volume 50, Numéro C8, Novembre 198936th International Field Emission Symposium
|Page(s)||C8-53 - C8-57|
J. Phys. Colloques 50 (1989) C8-53-C8-57
FORMATION OF RU-SUBCARBONYLS IN HIGH ELECTRIC FIELDL.C. WANG et H.J. KREUZER
Department of Physics, Dalhousie University, Halifax, Nova Scotia, B3H 3J5, Canada
A microscopic theory of field adsorption is used to investigate the formation of Ru-subcarbonyls in high electric field. Due to the repulsion between the COs adsorbed on the same top Ru atom, the COs displace as far as possible from each other, weakening the interaction between the Ru(CO)n species and the external electric field with rising index n. In strong external electric field, the net charge on the O atoms changes from negative to positive, so that the Ru-C bonds and, especially the C-O bonds tend to rotate towards the direction of the electric field, resulting in an increase of the repulsion between the COs, especially for the Ru-subcarbonyls with high index. In summary, increasing the field strength is disadvantageous to the formation of Ru-subcarbonyls with high index, a conclusion in good agreement with experiment.