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Earlier, we had shown how electron correlation effects in ?-electron virtual
excitation processes determine the large, ultrafast nonresonant nonlinear optical
responses of conjugated organic and polymeric materials1-3.
J. R. Heflin
"Two-photon correlated states and third order nonlinear optical processes in linear chains", Proc. SPIE 1599, Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine, (1 February 1992); https://doi.org/10.1117/12.2322314
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J. R. Heflin, "Two-photon correlated states and third order nonlinear optical processes in linear chains," Proc. SPIE 1599, Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine, (1 February 1992); https://doi.org/10.1117/12.2322314