Total reflection high-energy positron diffraction (TRHEPD)

13th International Workshop on Slow Positron Beam Techniques and Applications

Hyodo, T.^1 ; Fukaya, Y.^2 ; Maekawa, M.^2 ; Mochizuki, I.^1 ; Wada, K.^1 ; Shidara, T.^3 ; Ichimiya, A.^4 ; Kawasuso, A.^2

Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan^1

Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan^2

Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan^3

Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan^4

关键词: Atomic arrangement;    Positron beams;    Reconstructed surfaces;    Reflection high-energy positron diffraction;    Si (1 1 1);    Solid surface;    Total reflection;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012001/pdf
DOI  :  10.1088/1742-6596/505/1/012001

来源: IOP

【 摘 要 】

Total reflection high-energy positron diffraction (TRHEPD) promises to be an ideal technique for determining the atomic arrangement of solid surfaces. TRHEPD makes full use of the total reflection of the positron beam from a surface in reflection high-energy positron diffraction (RHEPD), the positron counterpart of reflection high-energy electron diffraction (RHEED). Owing to the development and use of a brightness-enhanced intense positron beam at KEK, it is now possible to obtain clear TRHEPD patterns. It is shown that the TRHEPD pattern from a Si(111)-7×7 reconstructed surface for the total reflection condition does not contain contributions from atoms in the bulk.