Photoassociation spectroscopy of Sr-88: Reconstruction of the wave function near the last node

We have investigated photoassociation (PA) spectra of ultracold Sr-88 atoms near the 5s(2) S-1(0)+5s5p P-1(1) atomic asymptote. The intensity modulation of the PA lines was used to reconstruct the ground-state scattering wave function, whose last nodal point was determined to be r(0)=3.78(18) nm. The PA lines also determined a precise lifetime of the P-1(1) state to be 5.263(4) ns.