Abstract
Existence of a population lens (PL) in the thermal lens (TL) signal is demonstrated by measuring the time dependence of a probe beam intensity after an excitation of C 60 /benzene solution under pulsed laser «thermal lens» experimental conditions. The intensity ratio of PL and TL is relatively large (0.45) at the probe beam (He-Ne laser) wavelength. The refractive index change calculated on the basis of absorption spectra from the ground and excited triplet states agrees well with the observed ratio
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