AVS 47th International Symposium
    Surface Science Thursday Sessions
       Session SS2+VT-ThM

Paper SS2+VT-ThM3
Angle Resolved Photoemission Study on Adsorption and Desorption of Cobaltocene on Cu(111)

Thursday, October 5, 2000, 9:00 am, Room 209

Session: Adsorption and Desorption Phenomena II
Presenter: J. Choi, Louisiana State University
Authors: J. Choi, Louisiana State University
P.A. Dowben, University of Nebraska, Lincoln
Correspondent: Click to Email
The molecular adsorption and desorption of cobaltocene, Co(C5H5)2, on Cu(111) have been studied by angle resolved photoemission spectroscopy (ARPES). We have measured the molecular orientation and bonding of adsorbed cobaltocene on Cu(111). Photoemission results indicate that the initially adsorbed surface species closely resembles that of molecular cobaltocene. The shift in photoemission binding energies relative to gas phase is largely independent of the molecular orbital. The molecule is adsorbed with cyclopentadienyl (C5H5) ring ligands parallel to the surface at 150K, and the molecular axis normal to the surface at the low coverage (below 10 Langmuir). The molecularly adsorbed cobaltocene loses the normal preferential orientation, at the higher coverages. Furthermore, molecular orientation is strongly affected by annealing temperature, indicating that there are more than one molecular adsorption states. With increasing of temperature, molecularly adsorbed cobaltocene on Cu(111) is desorbed.