Skip to Main content Skip to Navigation
Theses

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.
Complete list of metadatas

Cited literature [91 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-00007125
Contributor : Cristina Figl <>
Submitted on : Thursday, October 14, 2004 - 1:31:39 PM
Last modification on : Wednesday, September 16, 2020 - 5:38:29 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:21:37 PM

Identifiers

  • HAL Id : tel-00007125, version 1

Citation

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⟩

Share

Metrics

Record views

512

Files downloads

580