VISIBLE SPECTRA OF FRACTAL PARTICLES IN COLLOIDAL SOLUTIONS

The visible spectra of fractal colloidal particles are analysed. The c onsiderable broadening of the light absorption peak for colloidal solu tions is supposed to be due to additional oscillatory degrees of freed om arising in a fractal cluster. The shape of the low-frequency edge o f the absorption peak is shown to obey the following formula: I(lambda ) proportional to lambda(-D), where I is the intensity of the absorbed light, lambda is the wavelength and D is the fractal dimension of the particles in colloidal solution.