Studies on the resonance nonlinear scattering of aqueous CoFe2O4 nanoparticle

There are five resonance scattering peaks at 400,470,510,800 and 940 nm for aqueous CoFe 2O 4 nanoparticles It is a nonlinear scattering medium When excited wavelength is at 330 nm, there are a Rayleigh scattering peak at 330 nm ,a 1/2 fraction frequency peak at 660 nm and a 1/3 fraction frequency peak at 990 nm It exhibits a strongest double frequency peak at 400 nm and a Rayleigh scattering peak at 800 nm as the excited wavelength is at 800 nm The double frequency peak and the 1/2 fraction frequency peak have similar scattering property as the Rayleigh scattering peak A new concept including gray particle and white particle has been proposed, and applied to analysis of the resonance scattering spectra of CoFe 2O 4 nanoparticle system