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A: Atomphysik
A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)
A 10.5: Poster
Wednesday, April 4, 2001, 12:30–15:00, AT3
A New Scheme for Formation of Ultracold Molecules via Photoassociation — •Claude M. Dion, Olivier Dulieu, and Françoise Masnou-Seeuws — Laboratoire Aimé Cotton, CNRS, Bât. 505, Campus d’Orsay, 91405 Orsay Cedex, France
We demonstrate the existence of a new mechanism for the formation of ultracold molecules via photoassociation (PA) of cold cesium atoms and spontaneous emission. Using a Mapped Fourier Grid method [1], we calculate cold molecule formation rates, allowing us to interpret experimental results [2]. We show that the coupling between vibrational series of the Cs2 0u+ (6s+6p1/2) and (6s+6p3/2) states enables formation of ultracold molecules in vibrational levels of the ground state well below the 6s+6s dissociation limit. This resonant coupling mechanism appears fairly often as a non-Born-Oppenheimer interaction in molecular systems, and should be exploitable using other excited electronic states as PA intermediates or different species of cold molecules, such as other alkali dimers.
[1] V. Kokoouline, O. Dulieu, R. Kosloff, and F. Masnou-Seeuws, J. Chem. Phys. 110, 9865 (1999).
[2] C. M. Dion, C. Drag, O. Dulieu, B. Laburthe Tolra, F. Masnou-Seeuws and P. Pillet, Phys. Rev. Lett, submitted.