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In a recent paper, A. Akbari, N. H. March and A. Rubio [Phys. Rev. A. 76,032510 (2007)] have investigated the one-electron reduced density-matrix andthe momentum density of several two-electron model atoms, including the Hooke'satom. The method used by the authors for deriving an integral form of themomentum density is well suited for deriving a closed-form expression of theexact reciprocal form factor, which function is of importance inasmuch as itreflects the off-diagonal side of the exact reduced density-matrix.

Comments on the momentum density and the spatial form of the density-matrix of the Hooke's atom