[en] Computer-based systems for the acquisition and treatment of data from flash photolysis, laser photolysis and pulse radiolysis experiments are described. For the flash photolysis and laser photolysis systems, data acquisition of transient optical absorbance signals takes place via a Biomation 610B transient recorder of a Digital Equipment Corp. AR-11 real-time subsystem. The digitised data are stored in a PDP-11/10 computer and treated to obtain kinetic and spectral parameters such as rate constants. For the pulse radiolysis system, data acquisition also takes place via a Biomation 610B transient recorder, and data storage and reduction is carried out with a DEC PDP-11/03 LSI computer. Auxiliary equipment for control of the data acceptance is described, together with the computer programs used for data reduction. Examples of the use of the systems are given, and the advantages of a computer-based system over a manual system is discussed. (author)