Anharmonicity of the bending and stretching vibrations observed in extended X-ray absorption fine structure of tetrahedral molecules

被引：11

作者：

Yokoyama, T

Yonamoto, Y

Ohta, T

机构：

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1996年 / 65卷 / 12期

关键词：

extended X-ray absorption fine structure (EXAFS); anharmonicity; bending motion; stretching motion; thermal average; cumulant expansion; tetrahedral molecule;

D O I：

10.1143/JPSJ.65.3901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured and analyzed the temperature dependence of extended X-ray absorption fine structure (EXAFS) spectra of tetrahedral systems MBr(4) (M = C, Si, Ge). The EXAFS analysis by means of the cumulant expansion technique enables one to obtain information about force constants including the third-order anharmonicity. The second-order cumulants obtained experimentally are in excellent agreement with the values expected by the vibrational data and the third-order cumulants have been determined successfully. For the first nearest neighbor (NN) Br-M shells the stretching motions are apparently dominant to describe EXAFS, while for the second NN Br-Br shell the bending modes are found to contribute significantly to the cumulants especially for the third-order anharmonicity. The obtained force constants are compared to each other and the origin of observed bending anharmonicity is discussed.

引用

页码：3901 / 3908

页数：8

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