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Master's Dissertation
DOI
10.11606/D.54.1976.tde-27052014-163346
Document
Author
Full name
Gilmar Eugenio Marques
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1976
Supervisor
Title in Portuguese
Estados coerentes de fonons e efeito Mössbauer
Keywords in Portuguese
Efeito Mössbauer
Equação Fokker-Planck
Estados coerentes
Abstract in Portuguese
Neste trabalho introduzimos a representação de estados coerentes de fônons e desenvolvemos o formalismo para o tratamento do campo sujeito a excitações lineares. Obtemos a equação de Fokker-Planck para a função distribuição associada ao operador densidade assim como as amplitudes dos estados devidas à excitação. Como aplicação, usamos a interação fóton-núcleo para o estudo de algumas propriedades fundamentais do efeito Mössbauer. Obtivemos, de uma maneira muito simples, a energia e o momento linear transferidos ao cristal devido à absorção ou emissão de um raio gama e a relação entre o operador criação do estado coerente /β> e a função de espalhamento Fs(k, t). Mostramos claramente que o efeito Mössbauer é devido a transições de zero-fonons O efeito da temperatura sobre probabilidades de trasições e sobre medições também aparece de um modo claro
Title in English
Coherent states of phonons and Mössbauer effect
Keywords in English
Cohewrent states
Fokker-Planck equation
Mössbauer effect
Abstract in English
We introduce the representation of coherent states of phonons and develop the procedures to treat the field with linear excitation. We obtain the Fokker-Planck equation of the distribution function associated with the density operator as well as the amplitudes of the states due to the excitation. As an application, we use the interaction photon-nucleus in the study of some fundamental properties of Mössbauer effect. We obtain, in a very simple way, the energy and linear momentum transferred to the crystal due to absorption or emission of a gamma ray and the connection between the creation operator of the /β> coherent state and the scattering function Fs(k, t). We show clearly that Mössbauer effect is due to zero-phonon transitions. The effect of temperature on transition probabilities and measurements arises in a clear way
 
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Publishing Date
2014-05-28
 
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