Angular Streaking of Attosecond X-ray Pulses at the Linac Coherent Light Source

Angular streaking of attosecond pulses using intense laser fields is a powerful technique to characterize time-domain profiles of attosecond x-ray pulses, as well as dynamics in core-excited and core-ionized systems. We apply this technique at the Linac Coherent Light Source (LCLS) to study electronic coherence in core-excited states of 1,1-difluoroethylene using soft x-ray pulses. We also present the first attempt to extend angular streaking to hard x-ray (14 keV) attosecond pulses at the LCLS to diagnose the temporal profile of these pulses.