We report the creation of ultralong-range Sr2 molecules comprising one
ground-state 5s21S0 atom and one atom in a 5sns3S1 Rydberg state
for n ranging from 29 to 36. Molecules are created in a trapped ultracold
atomic gas using two-photon excitation near resonant with the 5s5p3P1
intermediate state, and their formation is detected through ground-state atom
loss from the trap. The observed molecular binding energies are fit with the
aid of first-order perturbation theory that utilizes a Fermi pseudopotential
with effective s-wave and p-wave scattering lengths to describe the
interaction between an excited Rydberg electron and a ground-state Sr atom.Comment: 5 pages, 2 figure