M. Pierre et al., NONLINEAR PROPERTIES OF INTERNAL CHARGE-TRANSFER MOLECULES IN RELATION WITH ELECTRONIC STATES, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 234, 1993, pp. 527-532
Measured SHG and THG hyperpolarizabilities of three organic molecules
with internal donor - acceptor charge transfer are compared to the res
ults of a two-level model based on a detailed analysis of linear molec
ular spectra.