Abstract

A stopped-flow apparatus for the study of fast reactions in solution is described. Its special features are that it permits accurate temperature control, that the flow system is chemically inert, and that flexible light-guides are employed in the optical system. When the absorbance change on reaction is 0.02, the ratio of signal change to noise under optimum conditions is around 500 and the rate constant can be determined with an accuracy of a few per cent. The temperature range so far used is -10 to +55 degrees C.

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