The localized vibrations of H-H-, D-D- and H-D- pairs in KCl, KBr, KI, RbCl and NaCl
Description
The localized vibrational modes of H-H-, D-D- and H-D- pairs in KCl, KBr, KI, RbCl and NaCl were studied for different pair configurations. The measured frequencies of the infrared active modes were found to be in good agreement with a model of two coupled harmonic oscillators. The line width for different modes in the salts studied is discussed. The temperature dependence for the transversal modes T1 and T2 of the line width for the H-H- pairs in KCl indicates that the broadening of these lines is due to the 'decomposition mechanism', that generates two phonons. The generated phonons due to the decay of the localized in phase mode are: -one acustic phonon of the lattice, -one localized phonon that corresponds to the out of phase vibration of the H-H- pair. The general properties, as the Ivey law and several particulars of the properties in the alkali-halides studied are presented
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Os modos vibracionais localizados dos pares H-H-, D-D- e H-D- em KCl, KBr, KI, RbCl e NaCl foram estudados para diversas configuracoes. As frequencias dos modos infravermelho ativos determinados experimentalmente, mostram boa concordancia com o modelo de dois osciladores harmonicos acoplados. A largura de linha para os diferentes modos nos cristais examinados e discutida. A dependencia com a temperatura da largura de linha para os modos transversais T1 e T2 no sistema KCl + H-H-, indica que o alargamento das mesmas e devido ao 'mecanismo de decomposicao', no qual dois fonons sao criados. Estes fonons sao devidos ao decaimento do modo localizado em fase num fonon acustico da rede e num fonon localizado fora de fase. Propriedades gerais, como a lei de Ivey e diversas outras particularidades dos halogenetos alcalinos estudados sao apresentadasFiles
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Additional details
Additional titles
- Original title (Portuguese)
- Vibracoes localizadas de pares H
Publishing Information
- Imprint Pagination
- 126 p.
- Report number
- INIS-mf--4005
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 9350673
- Subject category
- S74: ATOMIC AND MOLECULAR PHYSICS;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- DEUTERIUM IONS; FREQUENCY DEPENDENCE; HYDROGEN IONS; IMPURITIES; INFRARED RADIATION; LATTICE VIBRATIONS; OPTICAL PROPERTIES; PHONONS; POLARIZATION; POTASSIUM BROMIDES; POTASSIUM CHLORIDES; POTASSIUM IODIDES; RUBIDIUM CHLORIDES; SODIUM CHLORIDES; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ALKALI METAL COMPOUNDS; BROMIDES; BROMINE COMPOUNDS; CHARGED PARTICLES; CHLORIDES; CHLORINE COMPOUNDS; ELECTROMAGNETIC RADIATION; HALIDES; HALOGEN COMPOUNDS; INORGANIC PHOSPHORS; IODIDES; IODINE COMPOUNDS; IONS; PHOSPHORS; PHYSICAL PROPERTIES; POTASSIUM COMPOUNDS; QUASI PARTICLES; RADIATIONS; RUBIDIUM COMPOUNDS; SODIUM COMPOUNDS