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Radiation-Induced Transformations of an Isolated CH···HCN Complex: Possible Way to Synthesis of Interstellar Benzonitrile.
J Phys Chem A
December 2024
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991 Russia.
The recent detection of benzonitrile (CHCN) in the interstellar medium is one of the most fascinating discoveries in astrochemistry and molecular astrophysics. However, the mechanism of its formation in interstellar ices remains unclear. Here, we report the first evidence for the direct synthesis of benzonitrile through the radiation-induced transformations of an isolated CH···HCN complex in inert rigid media at cryogenic temperature (4.
View Article and Find Full Text PDFExperimental and Theoretical Insights on Gas Trapping of Noble Gases in MFU-4-Type Metal-Organic Frameworks.
Chemistry
November 2024
Chair of Solid State and Materials Chemistry, Institute of Physics, University of Augsburg, Universitätsstraße 1, 86159, Augsburg, Germany.
Isostructural metal-organic frameworks (MOFs), namely MFU-4 and MFU-4-Br, in which the pore apertures are defined by anionic side ligands (Cl and Br, respectively), were synthesized and loaded with noble gases. By selecting the type of side ligand, one can fine-tune the pore aperture size, allowing for precise regulation of the entry and release of gas guests. In this study, we conducted experiments to examine gas loading and release using krypton and xenon as model gases, and we complemented our findings with computational modeling.
View Article and Find Full Text PDFRadiation Resistance of High-Entropy Alloys CoCrFeNi and CoCrFeMnNi, Sequentially Irradiated with Kr and He Ions.
Materials (Basel)
September 2024
Institute of Nuclear Physics, Almaty 050032, Kazakhstan.
Article Synopsis
- This study investigated how irradiation from krypton and helium ions affects the structure and composition of high-entropy alloys (HEAs) at room temperature, specifically CoCrFeNi and CoCrFeMnNi.
- Findings showed that while elemental distribution remained stable, blisters formed on nickel surfaces due to the irradiation process, with large ones averaging 3.8 μm in diameter.
- The research noted significant changes in lattice parameters, stress levels (compressive and tensile), and dislocation densities in the HEAs post-irradiation, indicating differences in material responses between the two alloys.
Thermodynamics and simulation of 3D crystals and phase transitions under external fields.
J Chem Phys
August 2024
Ioffe Institute, 26 Polytechnicheskaya, St. Petersburg 194021, Russia.
A field-supported multiphase kinetic Monte Carlo method previously applied to self-assembled trimesic acid molecular layers [Ustinov et al., Phys. Chem.
View Article and Find Full Text PDFDevelopment of an X-ray ionization beam position monitor for PAL-XFEL soft X-rays.
J Synchrotron Radiat
September 2024
Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk 37673, Republic of Korea.
The Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) operates hard X-ray and soft X-ray beamlines for conducting scientific experiments providing intense ultrashort X-ray pulses based on the self-amplified spontaneous emission (SASE) process. The X-ray free-electron laser is characterized by strong pulse-to-pulse fluctuations resulting from the SASE process. Therefore, online photon diagnostics are very important for rigorous measurements.
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