Dong Guo-Sheng

GROWTH AND INTERFACE STRUCTURE OF MN ON INP (001)

An attempt to grow single crystalline thin films of body-centered-cubic (bcc) Mn on InP (001) has been carried out by molecular beam epitaxy. In situ reflection high energy electron diffraction and ex situ x-ray diffraction are used to characterize the film and interface structures. It is found that the metastable phase of bcc Mn fails to stabilize on the substrate despite of their perfect lattice-match. This result suggests again the importance of interface structure in the epitaxy of 3d metals on semiconductors.

An angle resolved photoemission study of InP(1̄1̄1̄) clean surface

The energy dispersive relation of surface dangling bond state on InP() clean surface has been measured by the angle resolved photomission. The theoretical calculation based on a slab model and extended Huckel theory agreed well with the experimental result if a surface relaxed atomic structure model for InP() (1×1) is postulated.

The effect of sodium adlayers on the adsorption of oxygen on Ag(100)

The application of HREELS to the study of the Ag(100)/Na+O2 system reveals the presence of molecularly adsorbed oxygen species at room temperature. This may help explain why alkali metals can enhance the selectivity of an Ag catalyst towards the formation of C2H4O.