Application of a multi-element Ge detector in laser pump/x-ray probe time-domain x-ray absorption fine structure

The characterization and application of a multi-element Ge solid state detector in time-domain laser pump, x-ray probe (LPXP) x-ray absorption fine structure (XAFS) using a third-generation synchrotron source (Advanced Photon Source or APS) are described. In particular, the following problems are discussed: (1) proper handling of high numbers of x-ray photons within a single pulse or pulse cluster, (2) optimizing the incident number of photons, (3) synchronization of the laser pulse, the x-ray pulse and the detector readout, and (4) shaping time and timing requirements of the detector. Based on the study, we estimate the detector efficiency for LPXP-XAFS experiments and identify the problems and possible solutions.

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