The influence of subsurface species on desorption kinetics :: 18O2/Zr(0001)

被引：12
作者：
Kang, YC
Ramsier, RD [1 ]
机构：
[1] Univ Akron, Dept Phys, Akron, OH 44325 USA
[2] Univ Akron, Dept Chem & Chem Engn, Akron, OH 44325 USA
来源：
APPLIED SURFACE SCIENCE | 2002年 / 195卷 / 1-4期
关键词：
subsurface species; desorption kinetics; zirconium;
D O I：
10.1016/S0169-4332(02)00541-X
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Isotopic oxygen (O-18(2)) adsorption on Zr(0001) surfaces at 185 K is investigated with Auger electron spectroscopy (AES), low energy electron diffraction (LEED) and temperature programmed desorption (TPD). The surface region of zirconium is saturated by low exposures of oxygen as determined by AES and LEED. However, as the exposure increases, thermal desorption features of (H2O)-O-18 (20 amu) and (H2O)-O-16 (18 amu) grow, with more (H2O)-O-16 than (H2O)-O-18 desorbing after isotopic oxygen exposure. These results indicate that significant kinetic mixing of surface and subsurface oxygen species as well as hydrogen transport from the bulk is involved in water production by this surface during heating. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：196 / 201
页数：6
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