摘要
前言清洁Al(100)、Al(110)和Al(111)的表面结构,从70年代开展研,并先后发现Al(110)表面存在振动弛豫。但这些结果彼此差别较大。本文采用自建的低能电子衍射动力学理论的能带近似公式,分别对Al(100)、Al(110)和Al(111)表面经理论计算与观测值的比较,结果发现Al(110)和Al(111)表面都存在振动弛豫。而Al(111)表面无此现象。
The relaxation of clean Al(100),Al(100),and Al(111) surfaces was calculated by one-dimensional band theory. It is shown that the calculated LEED spetra are in very good agreement with the experimental results, where the surface atomic layer distances are d_1 =1. 81±0. 01A(contracted 10. 2%±0. 01A) and d_2=2.14±0. 01A(expanded 6. 2%±0. 01A) for Al(100),and d_1=1.23±0. 03A (contracted 13. 7%±0. 03A) and d_2=1. 44±0. 02A (expanded 0. 98%±0. 02A) for Al(110),and d_1=2. 46+0.01A.(expanded 5. 6%±0.01A) for Al(111).
出处
《化学研究与应用》
CAS
CSCD
1993年第3期66-69,共4页
Chemical Research and Application
关键词
铝表面
振动弛豫
LEED谱
能带理论
Oscillatory relaxation of Aluminum
LEED spectra
Band tyeory
