Development and application of reflection high-energy positron diffraction

被引：13

作者：

Kawasuso, A

Okada, S

Ichimiya, A

机构：

[1] Japan Atom Energy Res Inst, Takasaki Estab, Takasaki, Gumma 3701292, Japan

[2] Nagoya Univ, Dept Appl Phys, Chikusa Ku, Nagoya, Aichi 4648603, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2000年 / 171卷 / 1-2期

关键词：

positron beam; positron diffraction; reflection high-energy positron diffraction (RHEPD); surface; hydrogen-terminated Si; surface dipole barrier;

D O I：

10.1016/S0168-583X(99)01203-3

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Reflection high-energy positron diffraction (RHEPD) has been utilized using a 20 keV positron beam generated by an electrostatic beam apparatus. The structure of a hydrogen-terminated Si(1 1 1) surface has been analyzed from the rocking curves with dynamical calculation. Residual surface roughness observed after the hydrogen-termination was explained as the presence of SiH3 molecule on monohydride surface. Reflectivities of positrons at Au, Ni and Ir(0 0 1) surfaces have been measured as a function of positron energy normal to surface. Abrupt decreases in the reflectivities were observed in the total reflection region of positrons, which are possibly associated with the surface dipole barriers. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：219 / 230

页数：12

共 34 条

[1] SEMI-EMPIRICAL CALCULATION OF THE SURFACE DIPOLE BARRIER IN METALS [J].