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Showing 1–10 of 10 results
Advanced filters: Author: N. Berrah Clear advanced filters

  • Two-color X-ray pulses with controlled time delay allow exciting one site of a molecule and then probing a different site of the same molecule with femtosecond resolution. Here, the authors use this hetero-site pump-probe technique to study charge redistribution and dissociation of the xenon difluoride molecule.

    • A. Picón
    • C. S. Lehmann
    • S. H. Southworth
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-6

  • A new scheme for multicolour X-ray free-electron lasers at soft X-ray wavelengths is proposed. The scheme significantly improves two-colour pulse generation and makes possible the first demonstration of three-colour pulse generation.

    • Alberto A. Lutman
    • Timothy J. Maxwell
    • Johann C. U. Zemella
    Research
    Nature Photonics
    Volume: 10, P: 745-750

  • Understanding the dynamics of molecules exposed to intense X-ray beams is crucial to ongoing efforts in biomolecular imaging with free-electron lasers. Here, the authors study C60molecules interacting with femtosecond X-ray free-electron laser pulses and present a model based on classical and quantum physics.

    • B. F. Murphy
    • T. Osipov
    • N. Berrah
    Research
    Nature Communications
    Volume: 5, P: 1-9

  • Chemical dynamics in molecules involve particle migration and bond rearrangement. Here the authors show single and double hydrogen migration in ethanol cations and dications that are generated by using intense laser pulse interaction with a jet of ethanol molecules.

    • Nora G. Kling
    • S. Díaz-Tendero
    • N. Berrah
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-8

  • Photoexciting molecules provides insights into their different degrees of freedom if the ultrafast electron and nuclei motion can be properly analysed. To this end, McFarland et al.use X-ray pump-probe techniques to show that Auger spectra can unveil information on nuclear relaxation in molecules.

    • B. K. McFarland
    • J. P. Farrell
    • M. Gühr
    Research
    Nature Communications
    Volume: 5, P: 1-7

  • Many photo-induced processes such as photosynthesis occur in organic molecules, but their femtosecond excited-state dynamics are difficult to track. Here, the authors exploit the element and site selectivity of soft X-ray absorption to sensitively follow the ultrafast ππ*/nπ* electronic relaxation of hetero-organic molecules.

    • T. J. A. Wolf
    • R. H. Myhre
    • M. Gühr
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-7

  • 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

  • With the start-up of the first X-ray free-electron laser, a new era has begun in dynamical studies of atoms. Here the facility is used to study the fundamental nature of the electronic response in free neon atoms. During a single X-ray pulse, they sequentially eject all their ten electrons to produce fully stripped neon. The authors explain this electron-stripping in a straightforward model, auguring favourably for further studies of interactions of X-rays with more complex systems.

    • L. Young
    • E. P. Kanter
    • M. Messerschmidt
    Research
    Nature
    Volume: 466, P: 56-61