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Electrical field for ground state, E1(r)	Electrical field for excited state, E2(r)	Effective field E3(r)

Effective field E₃(r)=E₂(r)-E₁(r) defines directions and the magnitudes of the forces, acting to the ions in the moment after the change of the charges of betaine atoms from ground to excited charges, if to suppose that the change is instantaneous and to use the model with the initial immovable and equilibrium ions.
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