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Population transfer routes to the lowest vibrational level of ultracold 39K85Rb

Optimal intermediate vibrational levels for stimulated Raman transfer (SRT) through the 4 1Σ+ state of 39K85Rb to form the lowest vibrational level of the ground X1Σ+ state from high vibrational levels of the X1Σ+ state (formed by decay from photoassociated ultracold molecules) have been determined using a multiplicative product of a molecular beam (MB) and an ultracold molecule (UM) excitation spectrum with the appropriate frequency offset.