Browsing by Author "Julienne, Paul S."

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    Mass scaling and nonadiabatic effects in photoassociation spectroscopy of ultracold strontium atoms
    (American Physical Society, 2014) Borkowski, Mateusz; Morzyński, Piotr; Ciuryło, Roman; Julienne, Paul S.; Yan, Mi; DeSalvo, Brian J.; Killian, T.C.
    We report photoassociation spectroscopy of ultracold 86Sr atoms near the intercombination line and provide theoretical models to describe the obtained bound-state energies. We show that using only the molecular states correlating with the 1S0+3P1 asymptote is insufficient to provide a mass-scaled theoretical model that would reproduce the bound-state energies for all isotopes investigated to date: 84Sr,86Sr, and 88Sr. We attribute that to the recently discovered avoided crossing between the 1S0+3P1 0+u (3Πu) and 1S0+1D2 0+u (1Σ+u) potential curves at short range and we build a mass-scaled interaction model that quantitatively reproduces the available 0+u and 1u bound-state energies for the three stable bosonic isotopes. We also provide isotope-specific two-channel models that incorporate the rotational (Coriolis) mixing between the 0+u and 1u curves which, while not mass scaled, are capable of quantitatively describing the vibrational splittings observed in experiment. We find that the use of state-of-the-art ab initio potential curves significantly improves the quantitative description of the Coriolis mixing between the two −8-GHz bound states in 88Sr over the previously used model potentials. We show that one of the recently reported energy levels in 84Sr does not follow the long-range bound-state series and theorize on the possible causes. Finally, we give the Coriolis-mixing angles and linear Zeeman coefficients for all of the photoassociation lines. The long-range van der Waals coefficients C6(0+u)=3868(50) a.u. and C6(1u)=4085(50) a.u. are reported.