Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Atom Loss and the Formation of a Molecular Bose-Einstein Condensate by Feshbach Resonance



V Yurovsky, A Ben-Reuven, Paul S. Julienne, Carl J. Williams


In experiments conducted recently at MIT on Na Bose-Einstein condensates [S. Inouye et al. Nature 392. 151 (1998): J. Stenger et al, Phys. Rev. Lett. 82. 2422 (1999)], large loss rates were observed when a time-varying magnetic field was used to tune a molecular Feshbach resonance state near the state of a pair of atoms in the condensate. A collisional deactivation mechanism [see V. A. Yurovsky, A. Ben-Reuven, P.S. Julienne and C.J. Williams, Phys. Rev. A 60, R765 (1999)], studied here in more detail, accounts for the results of the slow-sweep experiments. A best fit to the MIT data yields a rate coefficient for deactivating atom-molecule collisions of 1.6x10-10 cm3/8. In the case of the fast sweep experiment, a study was carried out of the combined effect of two competing mechanisms, the three-atom (atom-molecule) or four-atom (molecule-molecule) collisional deactivation versus a process of two-atom trap-state excitation by curve crossing. It is shown that both mechanisms contribute to the loss comparably and nonadditively.
Physical Review A (Atomic, Molecular and Optical Physics)
Vo. 62
No. 4


Bose-Einstein condensate, cold atomic collisions, coupled Gross-Pitaevskii equations, Feshbach resonance, sodium


Yurovsky, V. , Ben-Reuven, A. , Julienne, P. and Williams, C. (2000), Atom Loss and the Formation of a Molecular Bose-Einstein Condensate by Feshbach Resonance, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed July 12, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 30, 2000, Updated October 12, 2021