title: Covalent bonding: the role of exchange effects.
abstract: It is stressed that the two-center exchange energy components lead to a significant lowering of the total molecular energy because of exclusion of self-repulsion, and this is inevitable for covalent bond formation. The success of the two-center bond order index relies on the fact that it gives a qualitative estimate of this important phenomenon.
authors.affiliation: Research Centre for Natural Sciences, Hungarian Academy of Sciences , H-1519 Budapest, Hungary.
authors.forename: I
authors.initials: I
authors.lastname: Mayer