The two-dimensional autocorrelation function of island separations for commensurately adsorbed overlayers is evaluated and used to calculate the angular profiles of the diffracted beams from arbitrary distribution of ...The two-dimensional autocorrelation function of island separations for commensurately adsorbed overlayers is evaluated and used to calculate the angular profiles of the diffracted beams from arbitrary distribution of overlayer islands.Model calculations are made for a realistic surface.The results are compared to the low energy electron diffraction(LEED)measurement of O/W(112)system and quantitative structural information on the distribution of islands for overlayers is then extracted.展开更多
The orientational ordering in adsorbed incommensurate monolayers is discussed in an anharmonic approach.A nonlinear relationship is predicted between the orientation of the monolayer relative to the substrate and the ...The orientational ordering in adsorbed incommensurate monolayers is discussed in an anharmonic approach.A nonlinear relationship is predicted between the orientation of the monolayer relative to the substrate and the monolayer lattice parameter.Calculated values of the rninimum energy crientation angle for Ar on graphite are in good agreement with the experimental reported measurements.展开更多
By introducing mass density waves,we have determined the positions and intensities of a quartet of spots around the(±1/2,±1/2)positions on a clean Mo(100)surface at low temperature.lt is shown that the Mo(10...By introducing mass density waves,we have determined the positions and intensities of a quartet of spots around the(±1/2,±1/2)positions on a clean Mo(100)surface at low temperature.lt is shown that the Mo(100)-C(2x2)*incomensurate surface structure is a stable one and can be described in terms of a C(2x2)superlattice modulated by square-like-domains.The domain size and the direction of the domain structure relative to Mo(100)lattice are also discussed.展开更多
基金supported by the Science Fund of the Chinese Academy of Sciences。
文摘The two-dimensional autocorrelation function of island separations for commensurately adsorbed overlayers is evaluated and used to calculate the angular profiles of the diffracted beams from arbitrary distribution of overlayer islands.Model calculations are made for a realistic surface.The results are compared to the low energy electron diffraction(LEED)measurement of O/W(112)system and quantitative structural information on the distribution of islands for overlayers is then extracted.
基金the Science Fund of the Chinese Academy of Sciences。
文摘The orientational ordering in adsorbed incommensurate monolayers is discussed in an anharmonic approach.A nonlinear relationship is predicted between the orientation of the monolayer relative to the substrate and the monolayer lattice parameter.Calculated values of the rninimum energy crientation angle for Ar on graphite are in good agreement with the experimental reported measurements.
基金This work was supported by the Science Fund of the Chinese Academy of Sciences.
文摘By introducing mass density waves,we have determined the positions and intensities of a quartet of spots around the(±1/2,±1/2)positions on a clean Mo(100)surface at low temperature.lt is shown that the Mo(100)-C(2x2)*incomensurate surface structure is a stable one and can be described in terms of a C(2x2)superlattice modulated by square-like-domains.The domain size and the direction of the domain structure relative to Mo(100)lattice are also discussed.
