Adsorption geometry of furan on Si(100)-2×1

Abstract: We have investigated adsorption of furan on Si(100) at room temperature using high resolution photoemission spectroscopy (PES) and near edge X-ray absorption fine structure (NEXAFS) in the partial electron yield (PEY) mode. The Si 2p, C 1s, O 1s spectra of furan on Si(100) show that furan is chemisorbed on Si(100)-2×1 through [4+2] cycloaddition. NEXAFS has been conducted to characterize the adsorption geometry of furan on Si(100). Since the π∗ orbital of Cowed a good angle dependence in carbon K-edge NEXAFS spectra, the angle 28±2° determined from NEXAFS spectra appears to deviate from a theoretical value of 19° for the [4+2] cycloaddition by 9°, mostly due to the intrinsic defects on the Si(100)-2×1 substrate surface. [Copyright &y& Elsevier]