Photoemission study of Na and Cs adsorption on MgO(100)1 x 1

[摘要] Adsorption of Na and Cs on vacuum-cleaved MgO(100)1 X 1 surfaces has been studied with core and valence band photoemission spectroscopy. We conclude that both Na and Cs interact weakly with the surface except for small quantities of the initially adsorbed metals, Only trace amounts (less than or equal to 0.04 monolayers (ML)) of Cs could be found on the surface after doses that exposed the surface to many monolayers of Cs. Although larger amounts of Na (less than or equal to 1 ML) could be condensed on the surface, most of the Na is weakly physisorbed and easily desorbs at room temperature. However, a small fraction (0.02-0.045 ML) of both Na and Cs dosed onto MgO(100) appears to chemisorb on defect sites as indicated by an inability to desorb this fraction, The photoemission spectra for MgO(100) exposed to Na and Cs are unaffected by their presence except at high Na doses, where small changes are observed on the low kinetic energy side of the valence band and the high kinetic energy side of the Mg 2p feature.

[发布日期] 1996-05-15

[效力级别]  Proceedings Paper