Anharmonicity effects and phonon coupling of OH-divalent impurity complexes in alkali halides

被引：2

作者：

Beneventi, P ^{[1
]}

Capelletti, R ^{[1
]}

Darra, M ^{[1
]}

Fieschi, R ^{[1
]}

Fowler, WB ^{[1
]}

Gainotti, A ^{[1
]}

机构：

[1] LEHIGH UNIV,DEPT PHYS,BETHLEHEM,PA 18015

来源：

RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1995年 / 134卷 / 1-4期

关键词：

OH stretching; FTIR spectroscopy; alkali halides; impurities; anharmonicity;

D O I：

10.1080/10420159508227253

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

High resolution (0.04 cm(-1)) FTIR absorption measurements were performed in the range 9-300 K to study the vibrational modes of OH in NaCl:Cd++ and NaCl:Ca++. The narrow lines (down to similar to 0.05 cm(-1) at 9 K) in the range 3550-3600 cm(-1) were attributed to stretching of OH embedded in Me(++)-complexes on the basis of isotopic substitutions, thermal treatments, and different Me(++) contents. The spectra (fundamentals, overtones, and isotopic replicas) were analyzed in the framework of the Morse anharmonic oscillator model, whose parameters were evaluated and compared to those of similar systems. The temperature dependence of the line position and width, described by a single phonon coupling model, made it possible to determine the frequencies of the coupled phonons.

引用

页码：379 / 383

页数：5

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