Abstract
A fast read-out system for a linear photodiode detector has been developed for a time-resolved EXAFS experiment in dispersive mode. A green lightemitting phospher (Gd2O2:Tb) is deposited on a fiber optic faceplate, which is optically coupled with a linear photodiode array with 1024 sensor elements. A 12-bit fast A/D converter is used to process 1024 channel data in 5 msec and store them in memory. Digital data can be routed and stored in a histogram memory having 16 frames with 20 bits. 16 spectra can be rneasured successively with a time resolution of 5 msec and a variable interval time. An energy resolution of the total system is 5.6 eV at the Fe K-edge. for 1200 eV energy range. The application to a kinetic study demonstrates that time resolved EXAFS or near-edge spectra can be obtained with a time resolution of 25 msec by use of the present detector system.
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