
%0 Journal Article
%A Schipper, PE 
%T Pairwise intermolecular interaction energies between molecules of arbitrary symmetry: rotational averages in the weak interaction limit
%J Australian Journal of Chemistry
%D 1982/08/01
%V 35
%N 8
%P 1513-1524
%K 
%R https://doi.org/10.1071/CH9821513
%U https://www.publish.csiro.au/paper/CH9821513 
%X The fully expanded expression for the Boltzmann-averaged pairwise intermolecular interaction energy of two molecules B and C of arbitrary symmetry is determined in the weak interaction limit (<kT), including all electrostatic, induction and dispersion interactions having an r-n dependence (where r is the B-C separation) for which n < 11. The method exploits the 'point moment function' (PMF) approach in which the Boltzmann-averaged energy is shown to reduce to a sum of terms, each containing a product of a PMF on B, and one on C. The point moment functions may be obtained in a general analytic form by averaging an arbitrary multipolar product for the isolated molecule. Two types of PMF (&#916;, point chirality function, and &#923;, point achirality function) are identified, leading to a natural division of contributions to the intermolecular interaction energy into those that are insensitive (&#923;&#923; contributions) and sensitive (&#916;&#916; contributions) to molecular chirality. 
