A new absorption spectroscopy system with a time resolution of 20 picoseconds (ps) is described. Two parallel linacs which can accelerate single bunched beams (picosecond single beams) are used in the system. One linac of the two is used as an irradiation source and the other is used as a Čerenkov light source. The time interval between the irradiation source and the Čerenkov light source is changed by delaying the source beam for the Čerenkov light. The new system was named "Twin Linac Pulse Radiolysis System." This details of the twin-linac pulse-radiolysis system and some of the experimental results are described.
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