Dm. Bishop et Dw. Dekee, THE FREQUENCY-DEPENDENCE OF HYPERPOLARIZABILITIES FOR NONCENTROSYMMETRIC MOLECULES, The Journal of chemical physics, 105(18), 1996, pp. 8247-8249
Formulas are given which describe the quadratic and quartic frequency
dependence of hyperpolarizabilities for noncentrosymmetric molecules.
(C) 1996 American Institute of Physics.