Reflectance spectroscopy: application of the Kubelka-Munk theory to the rates of photoprocesses of powders.

The Kubelka-Munk theory of reflectance spectroscopy is used to derive an approximate equation that describes the rate of the photoprocess of a powdered sample in terms of the remission function. The equation is compared with one obtained using the particle model theory of diffuse reflectance and with experimental data for the photochemical reaction of powdered K(3)[Fe(C(2)O(4))(3)]-3H(2)O.