Thermal vibration charge distribution

Hamilton C E, Bierbaum V M and Leone S R 1985 Product vibrational state distributions of thermal energy charge transfer reactions determined by laser-induced fluorescence in a flowing afterglow Ar" + CC -> CC (v= 0-6) + Ar J. Chem. Rhys. 83 2284-92... 

There are two general cases of dipole-dipole forces those between molecules in which the distribution of electronic charge is centrosymmetric and those in which it is not. In the first case, there are no permanent electrical dipoles, whereas there is a permanent dipole if the charge distribution is non-centro-symmetric. When permanent dipoles are not present, there are nevertheless fluctuating dipoles as a result of atomic vibrations. These are always present because of zero-point motion. At temperatures greater than 0°K, thermal energy further excites the molecular vibrational modes which create fluctuating electric dipoles. 

Noda Y, Ohba S, Sato S, Saito Y (1983) Charge distribution and atomic thermal vibration in lead chalcogenide crystals. Acta Cryst B 39 312-317 487. Eeldmann C, Jansen M (1993) CS3AUO, the first ternary oxide with anionic gold. Angew Chem Int Ed 32 1049-1050... 

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