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View article: Atomic-scale ultrafast dynamics of local charge order in a THz-induced metastable state of 1T-TaS2
Atomic-scale ultrafast dynamics of local charge order in a THz-induced metastable state of 1T-TaS2 Open
Light-induced control of quantum materials enables manipulation of electronic and structural phases on ultrafast timescales. Probing their atomic-scale dynamics is essential to understand the role of defects and domain boundaries, but conv…
View article: Rotating spintronic terahertz emitter optimized for microjoule pump-pulse energies and megahertz repetition rates
Rotating spintronic terahertz emitter optimized for microjoule pump-pulse energies and megahertz repetition rates Open
Spintronic terahertz emitters (STEs) are powerful sources of ultra-broadband single-cycle terahertz (THz) field transients. They work with any pump wavelength, and their polarity and polarization direction are easily adjustable. However, a…
View article: Cascaded hard X-ray self-seeded free-electron laser at megahertz repetition rate
Cascaded hard X-ray self-seeded free-electron laser at megahertz repetition rate Open
High-resolution X-ray spectroscopy in the sub-nanosecond to femtosecond time range requires ultrashort X-ray pulses and a spectral X-ray flux considerably larger than that presently available. X-ray free-electron laser (XFEL) radiation fro…
View article: Cascaded hard X-ray self-seeded free-electron laser at MHz-repetition-rate
Cascaded hard X-ray self-seeded free-electron laser at MHz-repetition-rate Open
The European XFEL is currently the only high-repetition rate hard X-ray free electron laser (FEL) facility in operation worldwide. We significantly improved its capabilities by installing a cascaded Hard X-ray Self-Seeding (HXRSS) system, …
View article: Status of the Hard X-Ray Self-Seeding Setup at the European XFEL
Status of the Hard X-Ray Self-Seeding Setup at the European XFEL Open
A Hard X-Ray Self-Seeding (HXRSS) setup will be soon commissioned at the European XFEL. It relies on a two-chicanes scheme to deal, in particular, with the high pulse repetition rate of the facility. In this contribution we review the phys…
View article: Effect of Heat Load on Cryo-Cooled Monochromators at the European X-Ray Free-Electron Laser: Simulations and First Experimental Observations
Effect of Heat Load on Cryo-Cooled Monochromators at the European X-Ray Free-Electron Laser: Simulations and First Experimental Observations Open
European XFEL (EuXFEL) generates high-intensity ultra-short pulses at MHz repetition rate. At hard X-ray instruments, cryo-cooled silicon monochromators are used to reduce pulse bandwidth. Here, first experimental observations during commi…
View article: Thermal and Mechanical Stability of Bragg Reflectors under Pulsed XFEL Radiation
Thermal and Mechanical Stability of Bragg Reflectors under Pulsed XFEL Radiation Open
Free-electron laser(FEL) x-ray radiation can deliver pulses with a huge amount of energy in short time duration. X-ray optics like Bragg reflectors therefore must be chosen in a way that they can withstand radiation-material interaction wi…
View article: Identification of different pathways of electron injection in dye-sensitised solar cells of electrodeposited ZnO using an indoline sensitiser
Identification of different pathways of electron injection in dye-sensitised solar cells of electrodeposited ZnO using an indoline sensitiser Open
Charge transfer dynamics in fully operational dye sensitised solar cells as observed using ultrafast transient absorption spectroscopy.