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We report on the state-selective detection of near-dissociation ultracold KRbmolecules in the ground $X^1\Sigma^+$ state and the metastable $a^3\Sigma^+$state. The molecules are produced by photoassociation of ultracold atomsfollowed by radiative decay into high vibrational levels of the $X$ and $a$states. Detection utilizes resonance-enhanced one-color two-photon ionization,followed by time-of-flight mass spectroscopy. Scanning the detection laserfrequency over the range 582-625 nm, we observe transitions from the$v''$=86-92 levels of the $X$ state, which are bound by up to 30 cm$^{-1}$, andthe $v''$=17-23 levels of the $a$ state, which are also bound by up to 30cm$^{-1}$. The measured vibrational spacings are in excellent agreement withthose previously measured and those calculated from the relevant potentialcurves. Relative vibrational populations are also consistent with Franck-Condonfactors for decay from the photoassociated levels.Comment: 7 pages, 6 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

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State-selective detection of near-dissociation ultracold KRbXΣ+1anda