Improved pair-potential function for diatomic systems

Ground-state helium dimer: comparison of potential energies. Between new model, three-parameter model (XG2005), Tang-Toennies Model (TT1984), Tang-Toennies-Yiu model (TTY1995), LM2M2 (AS1991), variational LM2 (LM1989), quantum Monte Carlo (ATB1993), and experiment. 61