摘要
ＣＯ与Ｃｓ在Ｒｕ（１０１－０）表面上共吸附的高分辨电子能量损失谱研究结果表明：ＣＯ在有Ｃｓ覆盖的Ｒｕ（１０１－０）表面上有两种吸附状态，除了与ＣＯ在清洁表面上相似的一种吸附状态以外，还有一种新的吸附状态，它的Ｃ—Ｏ伸缩振动频率比前者低得多．在ＣＯ暴露过程中，ＣＯ分子首先吸附在低Ｃ—Ｏ伸缩振动频率的状态，随着ＣＯ覆盖度的增加，两种吸附状态的Ｃ—Ｏ伸缩振动频率都向高频方向移动．两种吸附状态的Ｃ—Ｏ伸缩振动频率也与Ｃｓ的覆盖度有关．当ＣＯ覆盖度饱和后。
Abstract CO+Cs/Ru(101-0) system has been investigated using HREELS. Two molecular adsorption states of CO were found. One with higher C—O frequency was similar to that on clean Ru(101-0) surface, while the other with lower C—O frequency appears on a Cs precovered Ru(101-0) surface. Two states of CO were occupied sequentially during the exposure to CO. The frequencies of both two loss peaks shift to higher values with exposure to CO and to lower values with higher Cs precoverage.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第3期544-549,共6页
Acta Physica Sinica
基金
国家自然科学基金资助的课题
