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The Hooke's-law atom ͑hookium͒ provides an exactly soluble model for a two-electron atom in which the nuclear-electron Coulombic attraction has been replaced by a harmonic one. Starting from the known exact position-space wave function for the ground state of hookium, we present the momentum-space wave function. We also look at the intracules, two-electron probability distributions, for hookium in position, momentum, and phase space. These are compared with the Hartree-Fock results and thedoi:10.1103/physreva.68.022505 fatcat:7byyfcrxz5dyvkk74n4avnoepa