Synchrotron-based laser pump/x-ray probe experiments on a ns or faster time scale have typically used ultrafast lasers suffering from the limitation of low repetition rates on the order of 1-10 kHz. This severely limits the data collection efficiency, since the x-ray bunches repeat at a much higher rate. This is particularly critical for XAFS experiments, which require very large S/N ratios (∼ 104 or better) to extract useful EXAFS far above the absorption edge. PNC-CAT has developed an apparatus based on a laser repeating at the rate of the APS bunch repetition frequency of 272 kHz, allowing an increase in data collection efficiency by two orders of magnitude. We have used this apparatus to obtain preliminary results for the time-resolved EXAFS from a 200nm thick polycrystalline Ge film which has been heated by the laser.
|Title of host publication||Synchrotron Radiation Instrumentation|
|Subtitle of host publication||8th International Conference on Synchrotron Radiation Instrumentation|
|Publisher||American Institute of Physics Inc.|
|Number of pages||4|
|State||Published - 12 May 2004|
|Event||8th International Conference on Synchrotron Radiation Instrumentation - San Francisco, United States|
Duration: 25 Aug 2003 → 29 Aug 2003
|Name||AIP Conference Proceedings|
|Conference||8th International Conference on Synchrotron Radiation Instrumentation|
|Period||25/08/03 → 29/08/03|
Bibliographical noteFunding Information:
PNC-CAT facilities and research at these facilities is supported by the US DOE Office of Science grant no. DE-FG03-97ER45628. Additional support was provided by Battelle-Pacific Northwest National Laboratory's Laboratory Directed Research Directorate (LDRD).
PNC-CAT facilities and research at these facilities is supported by the US DOE Office of Science grant no. DEFG03-97ER45628. Additional support was provided by Battelle-Pacific Northwest National Laboratory's Laboratory Directed Research Directorate (LDRD).
© 2004 American Institute of Physics.