The Theoretical Analysis of the Abnormal Absorption Effects in Surface Enhanced System

We have improved the preparation method of Ag sol in this paper, and adopted mechanical method to make the Ag sol aggregate. Its absorption peak lies near in 435nm. When we put other molecule into the system, the absorption band shows no obvious shift, but a new absorption band which is well known by people appears outside the 435 nm absorption band, the position of new absorption band will shift to long wave side by increasing the amount of other molecule which is put into the system. The quantum theory in this paper shows that the 435 nm absorption band is attributed to aggregate effect, it should be the characteristic of aggregation of silver sol. The new absorption band which appears at long wave side outside the 435 nm, our analysis demonstrates that it attributed to chemical absorption of Ag sol surface.