期刊
PHYSICAL REVIEW A
卷 78, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.78.061601
关键词
binding energy; Bose-Einstein condensation; potassium compounds; resonant states; spectral line broadening
资金
- CNR (EuroQUAM-QUDIPMOL)
- Ente CdR Firenze
- EU (STREP NAME-QUAM, CHIMONO)
- INFN (SQUAT-Super)
We report on the creation of heterospecies bosonic molecules, associated from an ultracold Bose-Bose mixture of K-41 and Rb-87, by using a resonantly modulated magnetic field close to two Feshbach resonances. We measure the binding energy of the weakly bound molecular states versus the Feshbach field and compare our results to theoretical predictions. We observe the broadening and asymmetry of the association spectrum due to the thermal distribution of the atoms and a frequency shift occurring when the binding energy depends nonlinearly on the Feshbach field. A simple model is developed to quantitatively describe the association process. This work represents a required step toward Bose-Einstein condensates of dipolar molecules.
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