摘要:
This work reports on the optical nonlinearities of a newly synthesized pyrazole derivative, namely (E)-1-(4-chlorophenyl)-4-(2-nitrovinyl)-1H-pyrazole. The Z-scan technique with femtosecond laser pulses was used to determine the two-photon absorption (2PA) cross-section spectrum, which presents a maximum of 67 GM at 690 nm. We have combined hyper-Rayleigh scattering (HRS) experiments and second-order Moller-Plesset perturbation theory (MP2) calculations to study the first hyperpolarizability (beta(HRS).). It was found that the MP2/6-311+G(d) model, taking into account solvent and dispersion effects, provides the beta(HRS) value of 40 x 10(-30) cm(5)/esu for the compound, in good agreement with the experimental result of 45 +/- 2 x 10(-3) cm(5)/esu. (C) 2012 Elsevier B.V. All rights reserved.