F. Luo, G.c. McBane, G. Kim, cr. Giese, and W.R. Gentry (J. Chem. Phys. 98, 3564 (1993)) reported experimental observation of the He2 complex, a species that had escaped detection for a long time. The fact that the observation required temperatures in the neighbourhood of 1mK is consistent with computational studies that suggest that hcl); for He, is about 1.51 x 10-3 J, hc Do about 2 x 10-'6 J, and Re about 297 pm.
(a) Estimate the fundamental vibrational wave number, force constant, moment of inertia, and rotational constant based on the harmonic oscillator and rigid-rotor approximations.
(b) Such a weakly bound complex is hardly likely to be rigid. Estimate the vibrational wave number and anharmonicity constant based on the Morse potential.