Spectrophotometric Equipment with Flash-Light Excitation
The method of flash-light excitation is widely applied in studying the mechanisms of photochemical reactions, in investigating the properties of the free radicals, and in studying the processes of transport and degradation of the energy of electron excitation. The information about the processes which take place as a result of the flash-light excitation is obtained by recording the changes in the optical density, in the electric conductivity, or in some other parameter of the object studied. Most frequently used is the recording of the absorption spectra of the transient products obtained upon the illumination of the object with a short and powerful flash-light pulse. Furthermore, the duration of the flash-light pulse must not exceed the half-live of the transient products obtained, so that the latter could be recorded, while the energy must be sufficiently high to secure a concentration of these products sufficient for their recording. That is why the duration and the energy of the flash-pulse are the two basic parameters which have been used ever since the creation of the method (1).
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