LOW-TEMPERATURE INFRARED SPECTRA BETWEEN 1200 AND 20 CM-1 AND NORMAL-COORDINATE ANALYSIS OF SILICATES WITH OLIVINE STRUCTURE

被引：34

作者：

OEHLER, O

GUNTHARD, HH

机构：

[1] Physical Chemistry Laboratory, Swiss Federal Institute of Technology, Zurich

[2] Chemistry Department, University of Alberta, Edmonton, Alta.

来源：

JOURNAL OF CHEMICAL PHYSICS | 1969年 / 51卷 / 11期

关键词：

D O I：

10.1063/1.1671859

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：

Infrared spectra of powdered samples of Mg2Sio 4(olivine) and 7-Ca2SiO4 (space group D 2h16, Z+4)were measured at liquid-N2 and liquid-He temperature between 1200 and 20 cm-1. The low-temperature spectra do not show noticeable band sharpening. Using a simple force field with five stretching-type force constants and symmetry-adapted coordinates, a normal-coordinate analysis is carried out for both crystal compounds. It is shown that satisfactory agreement between observed band frequencies and normal frequencies may be obtained through few iteration cycles. A number of features of the conventionally used group-vibration approach are confirmed by the normal-coordinate result, which in turn leads to a complete and fairly de-tailed assignment of the olivine-type infrared absorption spectra.

引用

页码：4719 / &

共 13 条

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[2]

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[3]

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[4]

LAZAREV AN, 1966, OPT SPECTRY S, V2, P150

[5]