Two-photon photoassociative spectroscopy of ultracold 88-Sr
Y. N. Martinez de Escobar, P. G. Mickelson, P. Pellegrini, S. B., Nagel, A. Traverso, M. Yan, R. Cote, T. C. Killian
TL;DR
This paper reports two-photon photoassociative spectroscopy of ultracold 88-Sr molecules, measuring binding energies to determine scattering lengths and observing quantum-optical effects like Autler-Townes splittings.
Contribution
It introduces a method to precisely measure binding energies and scattering lengths in ultracold Sr dimers using two-photon spectroscopy with narrow lines.
Findings
Measured the binding energy of the least-bound vibrational level.
Determined the s-wave scattering length as -1.4(6) a_0.
Observed Autler-Townes resonance splittings.
Abstract
We present results from two-photon photoassociative spectroscopy of the least-bound vibrational level of the X state of the Sr dimer. Measurement of the binding energy allows us to determine the s-wave scattering length, . For the intermediate state, we use a bound level on the metastable - potential, which provides large Franck-Condon transition factors and narrow one-photon photoassociative lines that are advantageous for observing quantum-optical effects such as Autler-Townes resonance splittings.
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