Non-Discriminating Dispersion Terms

In the ordinary theory of the dispersion interaction the electric perturbation term Hs. alone is included. The dispersion energy is then given by 

The interaction operator in (III.4) is the sum of electric and magnetic terms He +Hm, so that in the complete dispersion energy (III.9) 

The ratio of magnetic to electric dipole coupling strength for moments of 1 Bohr magneton and 1 Debye is 10i (4.8h/4 rwc)2 10-, where h is Planck s 

The electric-magnetic cross term in the total dispersion energy (III.9), namely 

The quantities defined in expression (III.13) are the components of the optical-rotatory pseudotensor. transforms under rotations like the second rank 

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