Abstract
KRS-5 crystals were designed and prepared for ATR method utilizing large incidence angles. By using these crystals, samples with high refractive indices or thin coating samples were analyzed successfully. For example, the rubbers with high carbon black contents which were difficult to be measured by usual ATR method because of their high refractivity were possible to be measured by applying the incidence angle 70°. In the same way, changing the incidence angle from 45° to 72°, several informations were obtained about thinner surface layers than those having been measured by usual ATR method.
