Results 31 to 40 of about 3,200 (182)

High-resolution electron time-of-flight spectrometers for angle-resolved measurements at the SQS Instrument at the European XFEL

Journal of Synchrotron Radiation, 2022
A set of electron time-of-flight spectrometers for high-resolution angle-resolved spectroscopy was developed for the Small Quantum Systems (SQS) instrument at the SASE3 soft X-ray branch of the European XFEL.
Alberto De Fanis, Markus Ilchen, Alexander Achner, Thomas M. Baumann, Rebecca Boll, Jens Buck, Cyril Danilevsky, Sergey Esenov, Benjamin Erk, Patrik Grychtol, Gregor Hartmann, Jia Liu, Tommaso Mazza, Jacobo Montaño, Valerija Music, Yevheniy Ovcharenko, Nils Rennhack, Daniel Rivas, Daniel Rolles, Philipp Schmidt, Hamed Sotoudi Namin, Frank Scholz, Jens Viefhaus, Peter Walter, Pawel Ziółkowski, Haiou Zhang, Michael Meyer   +26 more
doaj   +1 more source

XFELs for structure and dynamics in biology [PDF]

IUCrJ, 2017
The development and application of the free-electron X-ray laser (XFEL) to structure and dynamics in biology since its inception in 2009 are reviewed. The research opportunities which result from the ability to outrun most radiation-damage effects are outlined, and some grand challenges are suggested.
openaire   +4 more sources

Generation of time-synchronized two-color X-ray free-electron laser pulses using phase shifters

Scientific Reports, 2023
To optimize the intensity of X-ray free-electron lasers (XFELs), phase shifters, oriented in phase with the phases of the XFEL pulse and electron beam, are typically installed at undulator lines.
Myung-Hoon Cho, Teyoun Kang, Haeryong Yang, Gyujin Kim, Seong-Hoon Kwon, Kook-Jin Moon, Inhyuk Nam, Chang-Ki Min, Hoon Heo, Changbum Kim, Heung-Sik Kang, Chi Hyun Shim   +11 more
doaj   +1 more source

The first decade of XFELs [PDF]

Nature Reviews Physics, 2020
Over the past decade, several X-ray free-electron laser (XFEL) facilities have been constructed and started operation worldwide. New, high-repetition XFELs are expected to open to users in the next 5 years.
openaire   +1 more source

Experimental Demonstration of Attoseconds-at-Harmonics at the SASE3 Undulator of the European XFEL

Photonics, 2023
We report on observations of single spike spectra (3–13% of events) upon employing a previously proposed method for single spike generation via harmonic conversion. The method was tested at the soft X-ray SASE3 undulator of the European XFEL.
Andrei Trebushinin, Gianluca Geloni, Svitozar Serkez, Giuseppe Mercurio, Natalia Gerasimova, Theophilos Maltezopoulos, Marc Guetg, Evgeny Schneidmiller   +7 more
doaj   +1 more source

Comment on Photosystem II: light-dependent oscillation of ligand composition at its active site: existence of O6 in S₃-state photosystem II revealed by omit maps. [PDF]

Acta Crystallogr D Struct Biol
We reanalyzed our XFEL data, the results of which showed the insertion of O6 during the S2–S3 transition in water oxidation by photosystem II. These results contradict the interpretation proposed by Wang that there is no insertion of O6 during the S2–S3 transition.Photosystem II (PSII) catalyzes the light‐driven oxidation of water to molecular oxygen ...
Li H, Suga M, Shen JR.
europepmc   +2 more sources

The Role of Iron‐Hyponitrite Intermediates in Biology and Insights From Synthetic Model Complexes

Chemistry – A European Journal, EarlyView.
Despite the difference in active site architecture, NO reduction by different NOR enzymes is expected to be linked by a common intermediate: hyponitrite (N2O22−). However, experimentally, very little is known about the coordination chemistry of iron with hyponitrite and the expected Fe‐hyponitrite intermediates.
Michael O. Lengel, Nicolai Lehnert
wiley   +1 more source

Machine-learning-enhanced automatic spectral characterization of x-ray pulses from a free-electron laser

Communications Physics
A reliable characterization of x-ray pulses is critical to optimally exploit advanced photon sources, such as free-electron lasers. In this paper, we present a method based on machine learning, the virtual spectrometer, that improves the resolution of ...
Danilo Enoque Ferreira de Lima, Arman Davtyan, Joakim Laksman, Natalia Gerasimova, Theophilos Maltezopoulos, Jia Liu, Philipp Schmidt, Thomas Michelat, Tommaso Mazza, Michael Meyer, Jan Grünert, Luca Gelisio   +11 more
doaj   +1 more source

Sample Delivery Systems for Serial Femtosecond Crystallography at the PAL-XFEL

Photonics, 2023
Serial femtosecond crystallography (SFX) using an X-ray free electron laser (XFEL) enables the determination of room-temperature structures without causing radiation damage.
Jaehyun Park, Ki Hyun Nam
doaj   +1 more source

Ultrafast Transitions in X‐Ray Irradiated Solids

Contributions to Plasma Physics, EarlyView.
ABSTRACT In this review, we present current developments on modeling ultrafast transitions in solids triggered by intense, atto‐ to femtosecond pulses from X‐ray free electron lasers. This specific irradiation regime requires dedicated simulation tools based on theoretical and computational methods, involving the elements of classical and quantum ...
Sebastião Antunes, Konrad J. Kapcia, Vladimir Lipp, Beata Ziaja   +3 more
wiley   +1 more source