The pair population analysis developed some time ago as a straightforward link between quantum chemical
and classical picture of bonding was generalized by incorporating its formalism into the framework of AIM
theory. A detailed numerical comparison between the results derived from the original pair population analysis
and those from AIM generalization is reported. On the basis of this comparison, the reliability of both
approaches is evaluated. In addition to this a numerical test of the accuracy of the Lewis electron pair model
is also reported.
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