THE ADSORPTION OF NICKELOCENE - PART 1 - MOLECULAR BONDING ON AG(100)

The molecular adsorption and desorption of nickelocene, Ni(C5H5)(2), o n Ag(100) have been studied by both angle-resolved photoemission and t hermal desorption. Photoemission results indicate that the initially a dsorbed surface species closely resemble that of molecular nickelocene . The molecular axis is not along the surface normal, as determined by angle-resolved photoemission and angle-resolved thermal desorption sp ectroscopy. This is a different bonding orientation than that adopted by molecular ferrocene on Ag(100). The molecular nickelocene desorptio n energies resemble those observed for ferrocene on Ag(100) but are co mplicated by multiple chemisorption states and steric effects in the d esorption process. Nickelocene is unusual in that the molecular orient ation is seen to affect the angular dependence of molecular desorption . (C) 1997 Elsevier Science B.V.