A5002827624- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- 2D Materials and Applications
- Advanced Fiber Laser Technologies
- Chalcogenide Semiconductor Thin Films
- Photonic Crystal and Fiber Optics
- Advanced Semiconductor Detectors and Materials
Bielefeld University
2004-2017
Photoemission with a twist Attosecond time-resolved spectroscopy provides the ability to probe fastest electronic processes in atoms and solids. Yet photoemission process from solids is not fully understood. Siek et al. studied layered van der Waals material WSe 2 found that electron emission occurs as sequence of events are apparently time-ordered respect rising angular momentum involved initial states (see Perspective by Yakovlev Karpowicz). This result will help provide more detailed...
We report a detailed experimental and theoretical study on high-order harmonic generation of femtosecond Ti-sapphire laser focused at an intensity around 1015 W cm−2 onto high-pressure (50–210 mbar) neon gas cell variable length (1–3 mm). Using thorough three-dimensional simulations, we discuss the interplay between different factors influencing harmonic-generation efficiency, i.e. phase matching determined by electronic atomic dispersions, re-absorption harmonics medium refraction...
A time-resolved study of core-level chemical shifts in a monolayer aromatic molecules reveals complex photoinduced reaction dynamics. The combination electron spectroscopy for analysis and ultrashort pulse excitation the extreme ultraviolet allows performing time-correlated 4d-core-level iodine atoms that probe local environment adsorbate molecule. selectivity method unveils metastable molecular configurations appear about 50 ps after are efficiently quenched back to ground state.
Attosecond time-resolved XUV streaking experiments are reported for cleaved WSe2 surfaces. The photoemission from Se 3d and W 4f core levels occurs delayed by 50 attoseconds with respect to the valence band emission.
A new type of time-resolved photoelectron spectroscopy experiment is presented: the ESCA shifts 4d fine structure split core-level iodine atoms in iodophenylphenol molecules adsorbed perpendicular to (100) surface silicon has been studied and observed transiently fs-time resolved as a function delay between exciting ultrashort UV pulse ionizing XUV pulse.