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Showing 1–9 of 9 results
Advanced filters: Author: W. Helml Clear advanced filters

  • When the length of a light pulse approaches that of just a few wavelengths, the difference in the phase of its field relative to its overall shape, or envelope becomes important in how the pulse interacts with matter. Accurate measurements of this carrier-envelope phase previously required averaging over many separate pulses. Now it can be measured in one shot.

    • T. Wittmann
    • B. Horvath
    • R. Kienberger
    Research
    Nature Physics
    Volume: 5, P: 357-362

  • Some X-ray free-electron laser facilities are pushing towards sub-10 fs pulses, making it desirable to reduce errors in X-ray/optical delay measurements to the 1 fs level. Researchers have now demonstrated X-ray measurements with a temporal resolution shorter than 1 fs, opening up new possibilities for time-resolved X-ray experiments.

    • N. Hartmann
    • W. Helml
    • R. N. Coffee
    Research
    Nature Photonics
    Volume: 8, P: 706-709

  • A laser-based scheme for the simultaneous generation of two temporally synchronized electron beams with individually adjustable energies offers new opportunities for ultrafast pump–probe experiments.

    • J. Wenz
    • A. Döpp
    • S. Karsch
    Research
    Nature Photonics
    Volume: 13, P: 263-269

  • Self-referenced attosecond streaking enables in situ measurements of Auger emission in atomic neon excited by femtosecond pulses from an X-ray free-electron laser with subfemtosecond time resolution and despite the jitter inherent to X-ray free-electron lasers.

    • D. C. Haynes
    • M. Wurzer
    • A. L. Cavalieri
    Research
    Nature Physics
    Volume: 17, P: 512-518

  • X-ray free-electron lasers, important light sources for materials research, suffer from shot-to-shot fluctuations that necessitate complex diagnostics. Here, the authors apply machine learning to accurately predict pulse properties, using parameters that can be acquired at high-repetition rates.

    • A. Sanchez-Gonzalez
    • P. Micaelli
    • J. P. Marangos
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-9

  • Proton migration in the acetylene cation is commonly used as a model to study isomerisation dynamics. Here, the authors use X-ray pump-probe experiments to study this process, and show that isomerization occurs significantly faster than expected—within the first 12 femtoseconds following core ionization.

    • Chelsea E. Liekhus-Schmaltz
    • Ian Tenney
    • Vladimir S. Petrovic
    Research
    Nature Communications
    Volume: 6, P: 1-7