For investigations by absorption spectroscopy of intermediates generated by pulse irradiation—either flash photolysis or pulse radiolysis—a new method, kinetic spectrography, is described. The absorption spectrum is taken by means of a streak spectrograph working with a rotating mirror. As opposed to flash spectroscopy, one can by this technique get knowledge about the time behavior of a reaction in a single experiment. Good reproducibility of the pulse inducing the reaction—as demanded by flash spectroscopy—therefore, is not necessary and the method is widely usable. The required apparatus and applications of the new method go well with those of kinetic spectrometry. Some examples and quantitative evaluations are given to demonstrate the usefulness and reliability of the new method.

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