Asymmetrically perturbed field mechanism

Optical activity arises from the coupling of given electric-allowed transitions with a chiral orientation (coupled oscillator mechanism or two-electron mechanism) or from the electric or magnetic moments of a transition being pertubed by a chiral static field (asymmetrically perturbed field mechanism or one-electron mechanism) in the given one molecule. A similar mechanism of the optical activity can be expected for molecular assemblies which are composed of chiral and achiral ones. This type of optical activity is called induced optical activity and depends on types of inter-molecular interaction modes. 

The rigorous but unfortunately mathematically difficult approach to the problem of ionic clouds around moving ions is to seek the asymmetrical distribution functions and then work out the implications of such functions for the electric fields developed among moving ions. A simpler approach will be followed here. This is the relaxation approach. The essence of relaxation analysis is to consider a system in one state, then perturb it slightly with a stimulus and analyze the time dependence of the system s response to the stimulus. (It will be seen later that relaxation techniques are much used in modern studies of the mechanism of electrode reactions.)... 

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