We report third-order nonlinear optical properties of a stable radical species, 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-l-oxyl (PTIO). The nonresonant values of second hyperpolarizabilities measured by femtosecond Z-scan method at 780–857 nm were found to be negative. Wavelength dispersion of the hyperpolarizabilities is discussed referring to the theoretical predictions.
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Kamada et al. (1998) studied this question.
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