Photoemission study of 2-mercaptobenzoxazole deposited on Cu(100) surface

摘要

Adsorption of 2-mercaptobenzoxazole (MBO) on Cu(100) by controlled sublimation in ultra-high-vacuum conditions has been investigated by angular-integrated and angular-resolved high-resolution UV photoelectron spectroscopy, at RT and at 100 K. The valence band region presents new spectral features associated to a chemical interaction of MBO with Cu, that can be ascribed to a chemical bond formation between S and Cu 3d orbitals. Saturation is reached at RT with the chemisorbed phase formation, while a physisorbed MBO multilayer grows on top of the interfacial chemically interacting monolayer at LT. The RT-deposited chemisorbed phase shows a 2D long-range-ordered (2 x 2) reconstruction, and for this ordered phase we follow the energy band dispersion of the MBO-induced structures, along the ΓX direction of the SBZ.