Experimental evidence for an isotopic effect in the formation of ultracold ground-state rubidium dimers

Year: 2007

Authors: Fioretti A., Dulieu O., Gabbanini C.

Autors Affiliation: Istituto per i Processi Chimico-Fisici del CNR, Via Moruzzi 1, 56127 Pisa, Italy; Laboratoire Aimé Cotton, CNRS, Campus d

Abstract: We perform a comparative study of the formation of ultracold rubidium dimers in their ground state with both Rb-85 and Rb-87 isotopes. Ultracold rubidium molecules are created through photoassociation of ultracold atoms into rovibrational levels of the 0(u)(+)(5S(1/2) + 5P(1/2)) excited state, which interact through resonant coupling ( Dion et al 2001 Phys. Rev. Lett. 86 2253) with rovibrational levels of the 0(u)(+)(5S(1/2) + 5P(3/2)) excited state. The photoassociated levels decay by spontaneous emission down to rovibrational levels of the X-1 Sigma(+)(g) ground state. The resonant coupling is expected to enhance the formation of ultracold molecules in low-lying ground-state levels. By modelling the ionization spectrum of these ultracold molecules, we show that this coupling is larger for Rb-87(2) molecules than for Rb-85(2) molecules.

Journal/Review: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

Volume: 40 (16)      Pages from: 3283  to: 3293

KeyWords: cold molecules; laser cooling; spectroscopy
DOI: 10.1088/0953-4075/40/16/009

Citations: 14
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