Photoemission Studies of Ionic Crystal Surfaces (Materials Research)

离子晶体表面的光电发射研究（材料研究）

• 批准号: 8616170
• 负责人: Frederick Brown
• 金额: $ 2.15万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-15 至 1987-10-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8616170&HistoricalAwards=false
• 关键词: Photoemission; Studies; Ionic; Crystal; Surfaces

The silver halides will be studied by the techniques of angle integrated and angle resolved photoemission using continuously variable photon energy in the range 10 to 500 electron volts. Three types of experiments will be carried out: (1) The first is angle integrated valence band photoemission with photon energy variable through the Cooper minimum for the silver 4d levels. Thin polycrystalline samples will be employed, and an attempt will be made to separate d from p-derived valence bands by the known variation of photoemission cross section. The angular anisotropy factor will also be measured on these randomly oriented polycrystalline samples. (2) Angle resolved photoemission will be carried out on single sheet crystals in order to map the valence bands and observe calculated spin orbit splittings. (3) High resolution core level photoemission will be carried out in order to observe surface/volume core level shifts on well characterized silver bromide surfaces. High resolution thin film adsorption coefficients will be measured in the range 50 to 1500 electron volts on selected materials. These studies take on a new significance because of the current interest in the development of tunable solid state lasers.

利用10 ~ 500电子伏特的连续可变光子能量，采用角积分和角分辨光发射技术研究卤化银。将进行三种类型的实验：(1)第一类是银4d能级的角积分价带光电发射，光子能量通过库珀最小值变化。将采用薄的多晶样品，并尝试通过已知的光电发射截面变化来分离d和p衍生的价带。角各向异性因子也将测量这些随机取向的多晶样品。(2)在单片晶体上进行角度分辨光电发射，以绘制价带并观测计算出的自旋轨道分裂。(3)为了观察表征良好的溴化银表面上的表面/体积核能级变化，将进行高分辨率的核能级光电发射。高分辨率薄膜吸附系数将在50至1500电子伏特范围内对选定的材料进行测量。由于目前对可调谐固体激光器的发展兴趣浓厚，这些研究具有新的意义。