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Sci Rep. 2015 Jan 06;5:7644. doi: 10.1038/srep07644.

Following the dynamics of matter with femtosecond precision using the X-ray streaking method.

Scientific reports

C David, P Karvinen, M Sikorski, S Song, I Vartiainen, C J Milne, A Mozzanica, Y Kayser, A Diaz, I Mohacsi, G A Carini, S Herrmann, E Färm, M Ritala, D M Fritz, A Robert

Affiliations

  1. Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
  2. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
  3. Department of Chemistry, University of Helsinki, Helsinki FI-00014, Finland.

PMID: 25561027 PMCID: PMC4284506 DOI: 10.1038/srep07644

Abstract

X-ray Free Electron Lasers (FELs) can produce extremely intense and very short pulses, down to below 10 femtoseconds (fs). Among the key applications are ultrafast time-resolved studies of dynamics of matter by observing responses to fast excitation pulses in a pump-probe manner. Detectors with sufficient time resolution for observing these processes are not available. Therefore, such experiments typically measure a sample's full dynamics by repeating multiple pump-probe cycles at different delay times. This conventional method assumes that the sample returns to an identical or very similar state after each cycle. Here we describe a novel approach that can provide a time trace of responses following a single excitation pulse, jitter-free, with fs timing precision. We demonstrate, in an X-ray diffraction experiment, how it can be applied to the investigation of ultrafast irreversible processes.

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