Variation of the polarizability of the hydrogen molecule ion and the hydrogen molecule with internuclear separation

The variation of the polarizability of H   2 +and H 2 with internuclear separation R = 1.6 – R = 2.4 a.u. for H   2 +and R = 1.0 – R = 2.0 a.u. for H 2 is determined using a variational method suggested by Das and Bersohn. From these data, values of 〈α〉 0, J for which nuclear motion due to zero point vibration and centrifugal stretching is taken into account, are calculated at 300°K. The relative percent increases of the motion averaged values compared to the equilibrium values are as follows: 10.50% for H   2 +and 6.52% for H 2 .