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We show how to derive $X(x)$, which we call the Posmom intracule, from the many-particle wavefunction. We contrast it with the Dot intracule [Y. A. Bernard, D. L. Crittenden, P. M. W. Gill, Phys. Chem. Chem. Phys., 10, 3447 (2008)] which can be derived from the Wigner distribution and show the relationships between the Posmom intracule and the one-particle Posmom density [Y. A. Bernard, D. L. Crittenden, P. M. W .Gill, J.Phys. 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W. Gill, Pierre-Franc\\c{c}ois Loos, Yves A. Bernard","submitted_at":"2013-01-31T09:00:59Z","abstract_excerpt":"We introduce the two-particle probability density $X(x)$ of $x=\\bm{r}_{12}\\cdot\\bm{p}_{12}=\\left(\\bm{r}_1-\\bm{r}_2\\right) \\cdot \\left(\\bm{p}_1-\\bm{p}_2\\right)$. We show how to derive $X(x)$, which we call the Posmom intracule, from the many-particle wavefunction. We contrast it with the Dot intracule [Y. A. Bernard, D. L. Crittenden, P. M. W. Gill, Phys. Chem. Chem. Phys., 10, 3447 (2008)] which can be derived from the Wigner distribution and show the relationships between the Posmom intracule and the one-particle Posmom density [Y. A. Bernard, D. L. Crittenden, P. M. W .Gill, J.Phys. 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