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VOLUME 67 (1998) | ISSUE 1 | PAGE 51
Decay of mesoscopically localized vibrations in porous materials
PACS: 73.23.-b
The low temperature decay of a vibrational eigenstate of a crystalline mesoscopic particle surrounded by other such particles of approximately the same size is considered. The decay time is determined by the anharmonicity and the coupling between adjacent mesoscopic particles. Under some limiting conditions for particles of a typical size of 50 A the decay time at low temperatures can be several ms.