Produção Nacional
Optical suppression of hyperfine-changing collisions in a sample of ultracold sodium atoms
1997; American Physical Society; Volume: 55; Issue: 6 Linguagem: Inglês
10.1103/physreva.55.4407
ISSN1538-4446
AutoresSérgio Ricardo Muniz, Luís Gustavo Marcassa, Reginaldo de Jesus Napolitano, G. D. Telles, J. Weiner, Sérgio Carlos Zílio, Vanderlei Salvador Bagnato,
Tópico(s)Spectroscopy and Laser Applications
ResumoWe report the observation of hyperfine-changing collisions and the suppression of their rates in a sample of ultracold sodium atoms. We show that the suppression scheme used in the study of photoassociative ionization of Na [Phys. Rev. Lett. 76, 2033 (1996)] is also able to suppress the hyperfine-changing collisions, producing suppression up to 80%. The experimental results are compared with predictions of a simple Landau-Zener model and of a three-dimensional, multichannel close-coupling calculation. Both theories agree at low intensity, but at high intensity the experiment shows a saturation behavior that is qualitatively described only by the three-dimensional multichannel theory.
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