引言照相胶片的光学密度或银量,可作为对其显影速度的度量。胶片冲洗后可测得它的显影速度曲线,即光密度——时间曲线或还原银——时间曲线,但不能测出其显影期间的显影速度。用 ESR 能测出显影期间的自由基中间体。Charkoudian 等人讨论了半醌自由基在胶片显影初期的作用。llefter Introduction Optical density or silver content of photographic film can be used as a measure of its speed of development. After developing the film, its developing speed curve, that is, the optical density-time curve or the reducing silver-time curve, can be measured, but the developing speed during the development can not be measured. ESR can be used to measure free radical intermediates during development. Charkoudian et al. Discussed the role of semisynthetic free radicals in the early stages of film development. llefter