Jm. Vogels et al., DIABATIC MODELS FOR WEAKLY-BOUND STATES AND COLD COLLISIONS OF GROUND-STATE ALKALI-METAL ATOMS, Physical review. A, 57(5), 1998, pp. 4049-4052
We apply a simplified description to weakly bound states and cold-coll
ision continuum states of pairs of ground-state alkali-metal atoms, wh
ich complements the usual more elaborate coupled-channel treatment. It
is based on a diabatic treatment of the transition region between the
exchange-dominated interatomic distance range at small r and the hype
rfine-dominated range at large r. The models contain the degenerate in
ternal states approximation for H atoms as a special case.