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Träfflista för sökning "WFRF:(Laarmann T.) srt2:(2020-2022)"

Sökning: WFRF:(Laarmann T.) > (2020-2022)

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1.
  • Tanikawa, T., et al. (författare)
  • Volt-per-Ångstrom terahertz fields from X-ray free-electron lasers
  • 2020
  • Ingår i: Journal of Synchrotron Radiation. - 0909-0495 .- 1600-5775. ; 27, s. 796-798
  • Tidskriftsartikel (refereegranskat)abstract
    • The electron linear accelerators driving modern X-ray free-electron lasers can emit intense, tunable, quasi-monochromatic terahertz (THz) transients with peak electric fields of V Ångstrom(-1) and peak magnetic fields in excess of 10 T when a purpose-built, compact, superconducting THz undulator is implemented. New research avenues such as X-ray movies of THz-driven mode-selective chemistry come into reach by making dual use of the ultra-short GeV electron bunches, possible by a rather minor extension of the infrastructure.
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2.
  • Uhl, D., et al. (författare)
  • Extreme Ultraviolet Wave Packet Interferometry of the Autoionizing HeNe Dimer
  • 2022
  • Ingår i: Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185. ; 13:36, s. 8470-8476
  • Tidskriftsartikel (refereegranskat)abstract
    • Femtosecond extreme ultraviolet wave packet interferometry (XUV-WPI) was applied to study resonant interatomic Coulombic decay (ICD) in the HeNe dimer. The high demands on phase stability and sensitivity for vibronic XUV-WPI of molecular-beam targets are met using an XUV phase-cycling scheme. The detected quantum interferences exhibit vibronic dephasing and rephasing signatures along with an ultrafast decoherence assigned to the ICD process. A Fourier analysis reveals the molecular absorption spectrum with high resolution. The demonstrated experiment shows a promising route for the real-time analysis of ultrafast ICD processes with both high temporal and high spectral resolution. © 2022 American Chemical Society.
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3.
  • Uhl, D., et al. (författare)
  • Improved stabilization scheme for extreme ultraviolet quantum interference experiments
  • 2022
  • Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 55
  • Tidskriftsartikel (refereegranskat)abstract
    • Interferometric pump-probe experiments in the extreme ultraviolet (XUV) domain are experimentally very challenging due to the high phase stability required between the XUV pulses. Recently, an efficient phase stabilization scheme was introduced for seeded XUV free electron lasers (FELs) combining shot-to-shot phase modulation with lock-in detection [A. Wituschek et al., Nat Commun 11, 1 (2020)]. This method stabilized the seed laser beampath on the fundamental ultraviolet wavelength to a high degree. Here, we extend this scheme including the stabilization of the XUV beampath, incorporating phase fluctuations from the FEL high gain harmonic generation process. Our analysis reveals a clear signal improvement with the new method compared to the previous stabilization scheme.
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  • Resultat 1-3 av 3

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