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Doctoral Thesis
DOI
https://doi.org/10.11606/T.76.2006.tde-13092007-113228
Document
Author
Full name
Valter Aragão do Nascimento
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2006
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Libero, Valter Luiz
Machado, Luiz Eugenio
Misoguti, Lino
Vianna, Sandra Sampaio
Title in Portuguese
Dinâmica de colisões entre átomos de Rydberg frios
Keywords in Portuguese
Armadilha magneto óptica
Colisão de dois corpos
Estudo de colisões atômicas teórico e experimental
Abstract in Portuguese
Processos colisionais envolvendo transferência de energia têm sido intensivamente investigados em amostras de átomos de Rydberg frios nos últimos anos. Alguns grupos de pesquisa têm interpretado tais processos utilizando um modelo de muitos corpos; nosso grupo tem explicado tais processos, considerando a interação de dois corpos em um potencial de ultralongo alcance e o movimento sob a ação de um potencial. Nesta tese nós investigamos tais processos de colisão envolvendo átomos de Rydberg frios, produzidos em uma armadilha magneto-óptica. A investigação da evolução temporal de estados de Rydberg produzidos por colisões para diferentes densidades atômicas nos permite demonstrar que o processo binário é dominante. Além disso, mostramos que a radiação de corpo negro não pode ser desprezada nestes experimentos. Finalmente, sugerimos melhorias para um modelo semi-clássico de dinâmica colisional proposto por nosso grupo.
Title in English
Dymanics of collisions among rydberg atoms
Keywords in English
Collisions of two bodies
Theoretical and experimental study of atomics collisions
Trap magneto optical
Abstract in English
Collisional processes involving energy transfer have been intensively investigated in samples of cold Rydberg atoms in the last years. Some research groups have interpreted such processes using a many body model; on the other hand our group has explained such processes considering a two body interaction in an ultralong range potential and the atomic motion under the influence of such potential. In this work, we have investigated such atomic collisions involving cold Rydberg atoms, produced in a magneto-optical trap. The time evolution study of the Rydberg states produced by collisions for different atomic densities has shown us that the binary process is dominant in such system. Beyond that, we have shown that the radiation of black body cannot be neglected in these experiments. Finally, we suggest improvements for the semi-classical collissional dynamic model proposed by our group.
 
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ValterNascimento.pdf (5.05 Mbytes)
Publishing Date
2007-09-14
 
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