A5019103233- Geology and Paleoclimatology Research
- Climate variability and models
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Laser-Matter Interactions and Applications
- Particle Accelerators and Free-Electron Lasers
- Tree-ring climate responses
- Spectroscopy and Quantum Chemical Studies
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Photochemistry and Electron Transfer Studies
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
Max Planck Institute for Nuclear Physics
2020-2023
Heidelberg University of Education
2023
Heidelberg University
2021-2022
Ultrafast H2+ and H3+ formation from ethanol is studied using pump-probe spectroscopy with an extreme ultraviolet (XUV) free-electron laser. The first pulse creates a dication, triggering H2 roaming that leads to formation, which disruptively probed by second pulse. At photon energies of 28 32 eV, the ratio increases time delay, while it flat at energy 70 eV. delay-dependent effect ascribed competition between electron proton transfer. High-level quantum chemistry calculations show potential...
Abstract The dissociation dynamics of diiodomethane molecules (CH2I2) have been investigated following absorption 98 eV XUV photons. In the measurement at reaction microscope endstation free-electron laser FLASH2, ionic fragments created by 4d core ionisation followed Auger decay detected in coincidence. one-photon channel CH2+ / I+ I+, a concerted three-ion breakup and sequential via rotating intermediate CH2I++ ion identified. Classical simulations based on Coulomb repulsion model ab...
Abstract Ultrafast measurements in the extreme ultraviolet (XUV) spectral region targeting femtosecond timescales rely until today on two complementary XUV laser sources: free electron lasers (FELs) and high-harmonic generation (HHG) based sources. The combination of these source types was recently not realized. properties both sources including broad bandwidth, high pulse energy, narrowband tunability timing, open new opportunities for two-color pump-probe studies. Here we show first...
We present the design, integration, and operation of novel vacuum ultraviolet (VUV) beamline installed at free-electron laser (FEL) FLASH. The VUV source is based on high-order harmonic generation (HHG) in gas driven by an optical system synchronized with timing structure FEL. Ultrashort pulses spectral range from 10 to 40 eV are coupled FEL FL26, which features a reaction microscope (REMI) permanent endstation for time-resolved studies ultrafast dynamics atomic molecular targets. connection...
We present a HHG-based vacuum ultraviolet (VUV) source at the free electron laser FLASH2. The provides ultrashort pulses from 10 to 40eV, coupled REMI end-station (beamline FL26) for VUV-FEL pump-probe experiments.
We present a VUV beamline installed as pump-probe source at the free-electron laser FLASH. The is based on high-order harmonic generation driven by femtosec-ond near-infrared pulses synchronized with FEL burst mode.
<p>Climate variability, resulting from natural radiative forcing and interactions within the climate system, is a major source of uncertainty for regional projections. Constraining amplitude these variations fundamental to assess range plausible future scenarios. As instrumental record limited last two centuries, information about on multi-decadal millennial timescales relies analysis proxy records model simulations. However, current results systematic model-proxy...
<p>Jet streams control hydroclimate variability in the mid-latitudes with important impacts on water availability and human societies. According to future projections, global warming will change jet stream characteristics, including its mean position. Variability of these characteristics hourly-to-daily timescales is key understanding circulation. Therefore, most analysis methods present-day are designed for 6-hourly data. By modelling climate since Last Glacial Maximum, we can...
<p><span>Recent progress in modelling the Earth system has made it possible to produce transient climate simulations </span><span>longer than 10.000 years with comprehensive ESMs. These simulations</span><span> improv</span><span>e</span><span> our understanding of slow climatic feedbacks, state transitions, and abrupt changes....