Explicitly correlated coupled cluster R12 calculations of the dipole polarizability of $He2$

The effect of the interatomic interaction on the static dipole polarizability has been reexamined in detail for the He dimer at the equilibrium internuclear distance of $RHe… He=5.6$ $a0$ by using high-precision explicitly correlated $R12$ approaches. Our most accurate CCSD(T)-R12 results for the increments of the polarizability are $61.79×10−3$ a.u. for the anisotropy and $−1.04×10−3$ a.u. for the trace, not significantly different from recent literature CCSD data and confirming their high accuracy.