The green nanoparticles of silver in solution were prepared by a two step photochemical procedure, combining ultraviolet light and visible light irridiation, in the presence of the photoreducer, sodium citrate. There are three resonance scattering peaks at 340 nm, 470 nm and 520 nm and two absorption peaks at 399.4 nm and 691.5 nm for the green silver nanoparticles. Based on the facts of the formation of supramolecule in the substable state, the mechanisms for the resonance scattering light and the supramolecular reaction are proposed.

Key words: SILVER, NANOPHASE MATERIALS