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Master's Dissertation
DOI
https://doi.org/10.11606/D.76.2016.tde-11032016-111138
Document
Author
Full name
Henry Fernandes Passagem
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2016
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Cesar, Claudio Lenz
Tao, Lee Mu
 
Title in Portuguese
Fotoassociação de curto alcance em átomos de rubídio
Keywords in Portuguese
Armadilha de dipolo
Átomos frios
Colisões frias
Fotoassociação
Moléculas frias
Abstract in Portuguese
Neste trabalho, estudamos a fotoassociação de átomos de rubídio no regime de curto alcance. Realizamos espectroscopia por perda de átomos em uma armadilha magneto-óptica de 85Rb usando um laser de fibra de alta potência, o qual possuia largura de linha da ordem de 1MHz e 50W de potência no intervalo de 1060nm a 1070nm. Dois níveis vibracionais do potencial excitado 0u+ foram observados (v=137 e v=138). Além disso, medimos o tempo de vida de uma armadilha óptica de dipolo cruzada. Como esperado, o tempo de vida é menor quando o laser está sintonizado na ressonância. Um modelo teórico prevê a distribuição dessas moléculas nos níveis vibracionais do estado eletrônico fundamental após o processo de fotoassociação. Os resultados, nos sugerem perspectivas para a produção de moléculas de Rb2 no estado vibracional fundamental.
 
Title in English
Short-range photoassociation in rubidium atoms
Keywords in English
Cold atoms
Cold collisions
Cold molecules
Dipole trap
Photoassociation
Abstract in English
In this work, we studied short-range photoassociation of rubidium atoms. We realize trap-loss spectroscopy in a magneto-optical trap of 85Rb using high power fiber laser, which had around 1MHz linewidth and 50W power at 1060nm to 1070nm interval. Two vibrational levels of the 0u+ excited potential were observed (v=137 e v=138). Besides that, we measured the lifetime of a crossed optical dipole trapped. As expected, the lifetime is shorter when the laser is tuned on resonance. A theoretical model predicts the molecular distribution in the vibrational levels of electronic ground state. The results suggest us perspectives to produce Rb2 molecules in the ground vibrational state.
 
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Publishing Date
2016-03-14
 
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