SCHEDULED MAINTENANCE
A bond–bond description of the intermolecular interaction energy: the case of weakly bound N2–H2 and N2–N2 complexes
Abstract
The atom–bond pairwise additive approach, recently introduced by us to describe the potential energy surface for atom–molecule cases, is extended here for the first time to molecule–molecule systems. The idea is to decompose the van der Waals interaction energy into bond–bond pair contributions. This must be considered an improvement with respect to the familiar atom–atom pairwise additive representation since, still using a simple formulation, it indirectly accounts for three body effects. Such an approach also allows to include, in a straightforward way, the effect of the bond length on the intermolecular interaction energy. Cases of study are the weakly bound complexes involving the H2 and N2 molecules, namely N2–H2 and N2–N2, here described as a single bond–bond pair. For both systems ab initio calculations and experimental molecular beam
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