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We have studied interspecies scattering in an ultracold mixture of $^{87}$Rband $^{133}$Cs atoms, both in their lowest-energy spin states. The three-bodyloss signatures of 30 incoming s- and p-wave magnetic Feshbach resonances overthe range 0 to 667 G have been catalogued. Magnetic field modulationspectroscopy was used to observe molecular states bound by up to 2.5 MHz$\timesh$. Magnetic moment spectroscopy along the magneto-association pathway from 197to 182 G gives results consistent with the observed and calculated dependenceof the binding energy on magnetic field strength. We have created RbCs Feshbachmolecules using two of the resonances. We have set up a coupled-channel modelof the interaction and have used direct least-squares fitting to refine itsparameters to fit the experimental results from the Feshbach molecules, inaddition to the Feshbach resonance positions and the spectroscopic results fordeeply bound levels. The final model gives a good description of all theexperimental results and predicts a large resonance near 790 G, which may beuseful for tuning the interspecies scattering properties. Quantum numbers andvibrational wavefunctions from the model can also be used to choose optimalinitial states of Feshbach molecules for their transfer to the rovibronicground state using stimulated Raman adiabatic passage (STIRAP).

Towards the production of ultracold ground-state RbCs molecules: Feshbach resonances, weakly bound states, and coupled-channel model