Two-photon photoassociation of colliding ultracold ⁷Li atoms is used to probe the ³Σᵤ⁺(a) ground state of ⁷Li₂. The binding energy of the least-bound state of this triplet potential, υ0ex0ex=0ex0ex10, is found to be 12.47±0.04 GHz. This spectroscopic information establishes that the s-wave scattering length for ⁷Li atoms in the F0ex0ex=0ex0ex2, mF0ex0ex=0ex0ex2 state is (-27.3±0.8)a₀. The negative sign of the scattering length has important implications as to whether atoms at this doubly spin-polarized state can undergo a Bose-Einstein condensation.
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Abraham et al. (1995) studied this question.
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