Asynchronous sampling for ultrafast experiments with low momentum compaction at the ANKA ring

J Synchrotron Radiat. 2011 Jul;18(Pt 4):539-45. doi: 10.1107/S0909049511018267. Epub 2011 May 25.

Abstract

A high-repetition-rate pump-probe experiment is presented, based on the asynchronous sampling approach. The low-α mode at the synchrotron ANKA can be used for a time resolution down to the picosecond limit for the time-domain sampling of the coherent THz emission as well as for hard X-ray pump-probe experiments, which probe structural dynamics in the condensed phase. It is shown that a synchronization of better than 1 ps is achieved, and examples of phonon dynamics of semiconductors are presented.