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The kinetics of aqueous thiolated arsenic oxidation.
J Hazard Mater
January 2025
Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada. Electronic address:
Thiolated arsenic (As) compounds have been identified in various natural and engineered environments worldwide and are important for the biogeochemical cycling of As, yet quantitative data regarding their stability and transformation rates remains scarce. This study investigates the oxidation kinetics of mono-, di-, and tri-thioarsenate at varying pH, Fe, and (thio-)As concentrations in the aqueous phase. Experiments conducted over four weeks revealed that all thioarsenates were oxidized faster at lower pH, with rates of up to several μmoles/L/d at a pH of 3.
View Article and Find Full Text PDFErratum: "The Simons Observatory: Cryogenic half wave plate rotation mechanism for the small aperture telescopes" [Rev. Sci. Instrum. 95, 024504 (2024)].
Rev Sci Instrum
January 2025
Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Luminescence of the CsZrCl under High Pressure.
Inorg Chem
January 2025
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw 02-668, Poland.
The photoluminescence (PL) and Raman spectra of the CsZrCl crystal over a wide range of pressures were studied in this work for the first time. PL measurements were performed up to 10 GPa, while the Raman spectra were measured up to 20 GPa. The PL data revealed a linear blue shift of the emission maximum from about 2.
View Article and Find Full Text PDFHigh-Statistics Measurement of the Cosmic-Ray Electron Spectrum with H.E.S.S.
Phys Rev Lett
November 2024
Centre for Space Research, North-West University, Potchefstroom 2520, South Africa.
Owing to their rapid cooling rate and hence loss-limited propagation distance, cosmic-ray electrons and positrons (CRe) at very high energies probe local cosmic-ray accelerators and provide constraints on exotic production mechanisms such as annihilation of dark matter particles. We present a high-statistics measurement of the spectrum of CRe candidate events from 0.3 to 40 TeV with the High Energy Stereoscopic System, covering 2 orders of magnitude in energy and reaching a proton rejection power of better than 10^{4}.
View Article and Find Full Text PDFConsistency of Dark Energy Survey Year 1 Galaxy Clusters with Planck.
Phys Rev Lett
November 2024
Department of Physics, Boise State University, Boise, Idaho 83725, USA.
The recent Dark Energy Survey Year 1 (DES-Y1) analysis of galaxy cluster abundances and weak lensing produced Ω_{m} and σ_{8} constraints in 5.6σ tension with those derived from Planck. It is suggested in that work that this tension is driven by unmodeled systematics in optical cluster selection.
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