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Spectral ghost imaging simplifies ultrafast X-ray pump-probe experiments. This technique, applied at an X-ray free-electron laser (XFEL), separates spectral contributions, aiding the study of molecular dynamics.

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Area of Science:

  • Ultrafast spectroscopy
  • Quantum optics
  • X-ray science

Background:

  • Understanding molecular and bulk processes requires atomic-level insights into dynamical evolution.
  • Ultrafast timescales of nuclear and electronic motion are probed using pump-probe schemes.
  • Pump-probe experiments use excitation and delayed probing to capture system dynamics.

Purpose of the Study:

  • To apply spectral ghost imaging to time-resolved pump-probe experiments at an X-ray free-electron laser (XFEL) facility.
  • To demonstrate the utility of spectral ghost imaging in analyzing spectral absorption in the X-ray regime.
  • To simplify the interpretation of complex photoelectron spectra in pump-probe measurements.

Main Methods:

  • Utilized spectral ghost imaging in a pump-probe setup at an XFEL.
  • Exploited correlations in shot-to-shot fluctuations of X-ray pulses and measured electron kinetic energies.
  • Analyzed spectral absorption as the observable quantity.

Main Results:

  • Successfully applied spectral ghost imaging to time-resolved pump-probe measurements.
  • Demonstrated that spectral ghost imaging can simplify measurement interpretation.
  • Separated overlapping contributions to the photoelectron spectrum from pump and probe pulses.

Conclusions:

  • Spectral ghost imaging is a viable technique for time-resolved pump-probe experiments.
  • This method enhances the analysis of ultrafast dynamics at XFEL facilities.
  • The technique aids in distinguishing spectral features originating from different excitation pathways.