Internal cancellation of electric field induced second harmonic generation in solvent mixtures and solutions: An efficient protocol for the determination of molecular hyperpolarizability

Abstract

Electric field induced second harmonic generation (EFISHG) is a standard technique for the experimental determination of molecular hyperpolarizability. We have developed a novel cell design for EFISHG experiments that makes use of a conventional spectrometer glass cuvette. An efficient and convenient protocol is developed for the analysis of the EFISHG data making use of the internal cancellation of second harmonic generation in solvent mixtures and solutions to determine the first hyperpolarizability value. Calibration experiments and measurements on 4-nitroaniline in DMSO and NMP are presented. The first hyperpolarizability of the zwitterionic push-pull molecule, DCNQI, is measured in DMSO and NMP.