Near-threshold model for ultracold KRb dimers from interisotope Feshbach spectroscopy

Year: 2008

Authors: Simoni A., Zaccanti M., D’Errico C., Fattori M., Roati G., Inguscio M., Modugno G.

Autors Affiliation: Institut de Physique de Rennes, UMR 6251 du CNRS and Université de Rennes, 35042 Rennes Cedex, France; LENS and Dipartimento di Fisica, Università di Firenze, and INFM-CNR, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy; Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi,” Compendio del Viminale, 00184 Roma, Italy

Abstract: We investigate magnetic Feshbach resonances in two different ultracold K-Rb mixtures. Information on the (39)K-(87)Rb isotopic pair is combined with preexisting observations of resonance patterns for (40)K-(87)Rb. Inter-isotope resonance spectroscopy improves significantly our near-threshold model for scattering and bound-state calculations. Our analysis determines the number of bound states in singlet and triplet potentials and establishes precisely near-threshold parameters for all K-Rb pairs of interest for experiments with both atoms and molecules. In addition, the model verifies the validity of the Born-Oppenheimer approximation at the present level of accuracy.


Volume: 77 (5)      Pages from: 052705  to: 052705

KeyWords: Ground state; Magnetic resonance; Mathematical models; Mixtures; Rubidium compounds, Bound-state calculations; Interisotope Feshbach spectroscopy; Ultracold KRb dimers, Dimers; Collisional physics; Molecular potentials; Bose-Einstein condensation; Molecules; Resonances; Collisions; Atoms
DOI: 10.1103/PhysRevA.77.052705

Citations: 53
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