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Using new experimental measurements of photoassociation resonances near the$^1\mathrm{S}_0 \rightarrow \phantom{ }^3\mathrm{P}_1$ intercombinationtransition in $^{84}$Sr and $^{86}$Sr, we present an updated study into themass-scaling behavior of bosonic strontium dimers. A previous mass-scalingmodel [Borkowski et al., Phys. Rev. A 90, 032713 (2014)] was able toincorporate a large number of photoassociation resonances for $^{88}$Sr, but atthe time only a handful of resonances close to the dissociation limit wereknown for $^{84}$Sr and $^{86}$Sr. In this work, we perform a more thoroughmeasurement of $^{84}$Sr and $^{86}$Sr bound states, identifying multiple newresonances at deeper binding energies out to $E/h=-5$ GHz. We also identifyseveral previously measured resonances that cannot be experimentally reproducedand provide alternative binding energies instead. With this improved spectrum,we develop a mass-scaled model that reproduces the observed binding energies of$^{86}$Sr and $^{88}$Sr to within 1 MHz. In order to accurately reproduce thedeeper bound states, our model includes a second $1_u$ channel and morefaithfully reproduces the depth of the potential. As determined by the previousmass-scaling study, $^{84}$Sr $0_u^+$ levels are strongly perturbed by theavoided crossing between the $^1\mathrm{S}_0 + \phantom{ }^3\mathrm{P}_1$$0_u^+$ $(^3\Pi_u)$ and $^1\mathrm{S}_0 + \phantom{ }^1\mathrm{D}_2$ $0_u^+$$(^1\Sigma_u^+)$ potential curves and therefore are not included in thismass-scaled model, but are accurately reproduced using an isotope-specificmodel with slightly different quantum defect parameters. In addition, theoptical lengths of the $^{84}$Sr $0_u^+,\ \nu=-2$ to $\nu=-5$ states aremeasured and compared to numerical estimates to characterize their use asoptical Feshbach resonances.

Narrow-line photoassociation spectroscopy and mass-scaling of bosonic strontium