| Autor: |
R.W. Hellwarth, T.C. McGill, M. Mangir, H.V. Winston |
| Rok vydání: |
1973 |
| Předmět: |
|
| Zdroj: |
Journal of Physics and Chemistry of Solids. 34:2105-2115 |
| ISSN: |
0022-3697 |
| DOI: |
10.1016/s0022-3697(73)80058-7 |
| Popis: |
The absorption β in ionic insulators due to multiphonon processes is examined for frequencies higher than several times the reststrahl frequency. The frequency dependence and temperature dependence of β are calculated for simple models which include approximations appropriate to ionic insulators: anharmonic potential and an estimate of the influence of a small quadratic term in the dipole moment operator. The frequency dependence of β is found to be approximately exponential with a slope given by the log of the ratio of atomic displacement to a distance characterizing the onset of the anharmonicity in the potential. The calculated values of β are found to be in good agreement with the experimental results for reasonable values of the parameters in the models. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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