Photoassociative ionization in situations with low dimensions / Investigação do processo de foto-ionização associativa em situações com baixa dimensão

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Photoassociative ionization (PAI) in a cold sample of sodium atoms was the main subject of our studies as a way to understand the effects of repulsive states and collision dimensions. Two-color PAI experiment were preformed in a magneto-optical trap (MOT) trough the addition of a probe laser beam, the intensity, polarization and frequency of that probe laser were tunable. The shape of the trapped atoms also could be changed. In a spherical shape MOT, we observed a marked change in the PAI rate constant (K) for a definite frequency range, and that change can be attributed to the influence of repulsive molecular states and the a possible formation of an avoided crossing between molecular levels. In atomotron, ring shaped mot, we changed the polarization of the probe beam, and saw that the ratio between K for a polarization parallel to the atoms motion and a perpendicular one is 4. Comparing the K as a function of the intensity between a spherical shaped mot and atomotron showed us a difference in the behavior and the value of the rate constant.

ASSUNTO(S)

atomic collisions avoided crossing colisões atômicas photo associative ionization armadilha magneto-óptica atomotron repulsive molecular state magneto-optical trap estado molecular repulsivo cruzamento evitado foto-ionização associativa atomotron

ACESSO AO ARTIGO

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