
%0 Journal Article
%A Williams, GRJ 
%T Nonlinear Susceptabilities of Conjugated Organic Systems: Fused-ring Oligomers
%J Australian Journal of Physics
%D 1991/04/01
%V 44
%N 3
%P 299-304
%K 
%R https://doi.org/10.1071/PH910299
%U https://www.publish.csiro.au/paper/PH910299 
%X The finite-field modified neglect of diatomic overlap (MNDO) molecular orbital technique has been used to calculate the second hyperpolarisability (the molel:ular counterpart to the macroscopic nonlinear susceptability tensor X3) for selected fused-ring oligomers. The fusedring segments are the active electro-optic units in ladder polymers and rigid-rod/flexible-chain copolymers that are under current investigation as polymeric materials with applications in ultrafast optoelectronic devices. 
