Abstract
The perturbation expansions of the wavefunction, under the action of external monochromatic radiation are obtained, which have no secular or divergent terms, in presence of resonance (without any damping factor). The expectation values of the electric dipole moment operator with respect to these characteristic states are calculated. The dispersion formulae are obtained in the neighbourhood of resonance; they are free from any divergences. The dispersion curves obtained from them have all the basic features of the usual dispersion curves in the neighbourhood of resonance.
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