论文标题
位点特异性表面原子价带结构通过X射线立场激发光发射
Site-specific surface atom valence band structure via X-ray standing wave excited photoemission
论文作者
论文摘要
X射线内波（XSW）激发光电子发射用于测量在SRTIO3（001）表面生长的1/2单层（ML）PT的位点特异性带（VB）。 XSW在核心水平（CL）和从表面和底物原子的VB光发射中进行的调制，以进行三种HKL底物Bragg反射。 XSW CL分析表明，PT具有与底物具有类似FCC的立方体外延状态。 XSW VB信息与密度功能理论相比，从表面和底物原子中计算出的状态的预测密度。总体而言，这项工作代表了一种新的方法，用于确定来自特定原子表面位点的价电子对状态密度的贡献。
X-ray standing wave (XSW) excited photoelectron emission was used to measure the site-specific valence band (VB) for 1/2 monolayer (ML) Pt grown on a SrTiO3 (001) surface. The XSW induced modulations in the core level (CL) and VB photoemission from the surface and substrate atoms were monitored for three hkl substrate Bragg reflections. The XSW CL analysis shows the Pt to have an fcc-like cube-on-cube epitaxy with the substrate. The XSW VB information compares well to a density functional theory calculated projected density of states from the surface and substrate atoms. Overall, this work represents a novel method for determining the contribution to the density of states by valence electrons from specific atomic surface sites.
