The Ag cluster in solution has been prepared by a microwave high-pressure procedure. There is a maximum resonance Rayleigh scattering (RRS) peak at 425 nm (7.06 x 10(14) Hz) and a smaller RRS peak at 850 nm (1/2 x 7.06 x 10(14) Hz) by synchronous scattering at lambda(ex) = lambda(em). It is a nonlinear optical medium. When scattering the emission wavelength (lambda(em)) as the excited wavelength (lambda(ex)) at 425 nm (7.06 x 10(14) Hz), a maximum RRS peak was observed at 425 nm (7.06 x 10(14) Hz). A 1/2 fraction scattering peak at 850 nm (1/2 x 7.06 x 10(14) Hz) was also investigated. When lambda(ex) is at 850 nm (3.53 x 10(14) Hz), a frequency-doubling scattering peak at 425 nm is observed, and a RRS peak is displayed at 850 nm (3.53 x 10(14) Hz). When the lambda(ex) is two times longer than the maximum RRS wavelength (the strongest wavelength of pump band lambda(pb)) of an atomic cluster, a nonlinear scattering frequency-doubling peak (lambda(pb)) exhibits at half of the lambda(ex), which is stronger than the RRS peak. This phenomenon is defined as pump effect.
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