| Abstract
| - Adsorbed states of cyclopentene on Si(100)(2×1) have been investigated by means of low energy electrondiffraction (LEED), valence and Si 2p photoelectron spectroscopy (PES) using synchrotron radiation, andhigh-resolution electron energy loss spectroscopy (HREELS). Valence and Si 2p PES results indicate that thedangling bonds of the Si(100)(2×1) dimer and the π-bond of cyclopentene interact with each other, resultingin the formation of Si−C bonds. The valence electronic structure of adsorbed cyclopentene is similar to thatof gas-phase cyclopentane. In addition, the HREELS spectra of cyclopentene on Si(100)(2×1) resemble thevibrational spectra of free cyclopentane and the cyclopentene di-σ bonded to Pt(111). Therefore, we concludethat cyclopentene is di-σ bonded to the Si(100)(2×1) surface and the molecular structure is similar to that ofcyclopentane (all the carbon atoms are in sp3 state); the possible adsorbed structures are discussed. At saturation,76% of the dimers are reacted, indicating that the unreacted dimer sites exist owing to the steric hindranceof adjacent molecules.
|
