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Optical collisions in crossed beams and Bose-Einstein condensation in a microtrap

Cristina Figl 1 
1 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Optical collisions are studied in a crossed beams experiment. Differential cross sections of K-Ar
collisions are measured and are used to derive the repulsive parts of the XΣ and BΣ potential
curves. The achieved accuracy has not been realized with scattering experiments before. A collision
energy resolved analysis of the final state probes the relative population of the fine-structure
states K(4p1/2) and K(4p3/2) which depends on details of the outer part of the potentials. Calculations
from the determined potentials are in concordance with the experimental results. The
relative population of the Na fine-structure states after Na-N2 and Na-O2 collisions is determined
similarly. The results for N2 are in very good agreement with the theory. Differential cross sections
of Ca-Ar optical collisions are measured for an asymptotically forbidden transition. The
spectral dependence of the signal intensity shows a characteristic maximum. The experimental
data are in good agreement with ab initio calculations.

Wires on a microchip create a magnetic trap that is used to obtain a Rb-87 Bose-Einstein condensate.
The roughness of the magnetic potential is characterized by the measured density of a cold
atom cloud. The measured roughness is compared to the roughness that is calculated from the
geometry of the microwire.
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Submitted on : Thursday, October 14, 2004 - 1:31:39 PM
Last modification on : Saturday, June 25, 2022 - 11:12:41 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:21:37 PM


  • HAL Id : tel-00007125, version 1


Cristina Figl. Optical collisions in crossed beams and Bose-Einstein condensation in a microtrap. Atomic Physics [physics.atom-ph]. Université Paris Sud - Paris XI, 2004. English. ⟨tel-00007125⟩



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