Diatomic chemical interactions, average

Average entropic descriptors of diatomic chemical interactions... 

The energy gain due to the interaction of the polarizability of one system and the field of the transition dipoles of the other is the so-called dispersion energy. For atom atom or atom-diatom interactions typical values of the dispersion constant Cjisp are in the range 10 —10 erg cm . It is a correlation effect because the electronic polarizability of one molecule is responding to the instantaneously fluctuating transition dipole on another molecule. It does not average out because it is the square of the transition dipole that enters Eq. (2.19). Despite the weakness of the dispersion interaction it is chemically relevant. This is particularly so when there are many atoms in proximity, as when two... 

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