Total reflection high-energy positron diffraction (TRHEPD)

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(lll)-7×7 reconstructed surface for the total reflection condition does not contain contributions from atoms in the bulk.