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Design and performance of a magnetic bottle electron spectrometer for high-energy photoelectron spectroscopy.
Rev Sci Instrum
December 2024
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
We describe the design and performance of a magnetic bottle electron spectrometer (MBES) for high-energy electron spectroscopy. Our design features a 2 m long electron drift tube and electrostatic retardation lens, achieving sub-electronvolt (eV) electron kinetic energy resolution for high energy (several hundred eV) electrons with a close to 4π collection solid angle. A segmented anode electron detector enables the simultaneous collection of photoelectron spectra in high resolution and high collection efficiency modes.
View Article and Find Full Text PDFControlled molecule injector for cold, dense, and pure molecular beams at the European x-ray free-electron laser.
Rev Sci Instrum
November 2024
Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
A permanently available molecular-beam injection setup for controlled molecules (COMO) was installed and commissioned at the small quantum systems (SQS) instrument at the European x-ray free-electron laser (EuXFEL). A b-type electrostatic deflector allows for pure state-, size-, and isomer-selected samples of polar molecules and clusters. The source provides a rotationally cold (T ≈ 1 K) and dense (ρ ≈ 108 cm-3) molecular beam with pulse durations up to 100 µs generated by a new version of the Even-Lavie valve.
View Article and Find Full Text PDFConstructing S-scheme heterojunction CsBiBr/BiOBr via in-situ partial conversion to boost photocatalytic N fixation.
J Colloid Interface Sci
January 2025
MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China.
The judicious construction of interfaces with swift charge communication to enhance the utilization efficiency of photogenerated carriers is a viable strategy for boosting the photocatalytic performance of heterojunctions. Herein, an in-situ partial conversion strategy is reported for decorating lead-free halide perovskite CsBiBr nanocrystals onto BiOBr hollow nanotube, resulting in the formation of an S-scheme heterojunction CsBiBr/BiOBr. This unique in-situ growth approach imparts a closely contacted interface to the CsBiBr/BiOBr heterojunction, facilitating interfacial electron transfer and spatial charge separation compared to a counterpart (CsBiBr:BiOBr) fabricated via traditional electrostatic self-assembly.
View Article and Find Full Text PDFStructure and size of complete hydration shells of metal ions and inorganic anions in aqueous solution.
Dalton Trans
September 2024
Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-750 07 Uppsala, Sweden.
The structures of nine hydrated metal ions in aqueous solution have been redetermined by large angle X-ray scattering to obtain experimental data of better quality than those reported 40-50 years ago. Accurate M-O and M-(O-H)⋯O distances and M-O(H)⋯O bond angles are reported for the hydrated magnesium(II), aluminium(III), manganese(II), iron(II), iron(III), cobalt(II), nickel(II), copper(II) and zinc(II) ions; the subscripts I and II denote oxygen atoms in the first and second hydration sphere, respectively. Reported structures of hydrated metal ions in aqueous solution are summarized and evaluated with emphasis on a possible relationship between M-O-O bond angles and bonding character.
View Article and Find Full Text PDFAssembly of Differently Sized Supercharged Protein Nanocages into Superlattices for Construction of Binary Nanoparticle-Protein Materials.
ACS Nano
September 2024
Institute of Physical Chemistry, Department of Chemistry, University of Hamburg, Hamburg 20146, Germany.
This study focuses on the design and characterization of binary nanoparticle superlattices: Two differently sized, supercharged protein nanocages are used to create a matrix for nanoparticle arrangement. We have previously established the assembly of protein nanocages of the same size. Here, we present another approach for multicomponent biohybrid material synthesis by successfully assembling two differently sized supercharged protein nanocages with different symmetries.
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