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Bulletin of the American Physical Society

Investigation of a resonantly coupled photoassociation resonance for production of ultracold, polar molecules in the absolute vibrational ground state

Patrick Zabawa, Amy Wakim, Marek Haruza, N. P. Bigelow

Published Jun 16, 2011• 0 citations
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Ultracold LiCs molecules in the absolute ground state $X^{1}\ensuremath{\Sigma}^{+}$, ${v}^{\ensuremath{'}\ensuremath{'}}=0$, ${J}^{\ensuremath{'}\ensuremath{'}}=0$ are formed via a single photoassociation step starting from laser-cooled atoms. The selective production of ${v}^{\ensuremath{'}\ensuremath{'}}=0$, ${J}^{\ensuremath{'}\ensuremath{'}}=2$ molecules with a 50-fold higher rate is also demonstrated. The rotational and vibrational state of the ground state molecules is determined in a setup combining depletion spectroscopy with resonant-enhanced multiphoton ionization time-of-flight spectroscopy. Using the determined production rate of up to $5\ifmmode\times\else\texttimes\fi{}{10}^{3}\text{ }\text{ }\mathrm{\text{molecules}}/\mathrm{s}$, we describe a simple scheme which can provide large samples of externally and internally cold dipolar molecules.
Using resonance-enhanced two-photon ionization, we detect ultracold, metastable RbCs molecules formed in their lowest triplet state $a\text{ }^{3}\ensuremath{\Sigma}^{+}$ via photoassociation in a laser-cooled mixture of 85Rb^{85}\mathrm{Rb}85Rb and 133Cs^{133}\mathrm{Cs}133Cs atoms. We obtain extensive bound-bound excitation spectra of these molecules, which provide detailed information about their vibrational distribution, as well as spectroscopic data on several RbCs molecular states including $a\text{ }^{3}\ensuremath{\Sigma}^{+}$, $(2)\text{ }^{3}\ensuremath{\Sigma}^{+}$, and $(1)\text{ }^{1}\ensuremath{\Pi}$. Analysis of this data allows us to predict strong transitions from observed levels to the absolute vibronic ground state of RbCs, potentially allowing the production of stable, ultracold polar molecules at rates in excess of ${10}^{6}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$.