Reflection high-energy positron diffraction: the past 15 years and the future

16th International Conference on Positron Annihilation

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

Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan^1

Institute of Materials Structure Science, High Energy Accelerator Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan^2

关键词: Future prospects;    Phase transition phenomenon;    Positive charges;    Positron beams;    Reflection high-energy positron diffraction;    Surface layers;    Surface science;    Surface systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012068/pdf
DOI  :  10.1088/1742-6596/443/1/012068

来源: IOP

【 摘 要 】

Reflection high-energy positron diffraction (RHEPD) is the positron counterpart of reflection high-energy electron diffraction (RHEED). Owing to the positive charge of the positron, RHEPD provides a powerful tool with which to determine the structure of the first surface layer. We have been investigating important surface systems concerning their unique electric and magnetic properties and also phase transition phenomena using positron beams (flux: 103∼104e+/sec) with22Na sources. Currently, we are developing a new RHEPD apparatus with a bright and intense positron beam (flux: 105e+/sec) based on the LINAC at the Slow Positron Facility, KEK. Here, we summarize the past results and the future prospects of the RHEPD study in the surface science.