Search
Results
-
Roles of band gap and Kane electronic dispersion in the terahertz-frequency nonlinear optical response in HgCdTe
(2024)Physical Review BMaterials with linear electronic dispersion often feature high carrier mobilities and unusually strong nonlinear optical interactions. In this work, we investigate the (THz) nonlinear dynamics of one such material, HgCdTe, with an electronic band dispersion heavily dependent on both temperature and stoichiometry. We show how the band gap, carrier concentration and band shape together determine the nonlinear response of the system. At low ...Journal Article -
The increasingly dominant role of climate change on length of day variations
(2024)Proceedings of the National Academy of Sciences of the United States of AmericaThe melting of ice sheets and global glaciers results in sea-level rise, a pole-to-equator mass transport increasing Earth's oblateness and resulting in an increase in the length of day (LOD). Here, we use observations and reconstructions of mass variations at the Earth's surface since 1900 to show that the climate-induced LOD trend hovered between 0.3 and 1.0 ms/cy in the 20th century, but has accelerated to 1.33 [Formula: see text] 0.03 ...Journal Article -
Cyclopentadienone Iron Complex-Catalyzed Hydrogenation of Ketones: The Influence of the Charge-Tag on Catalytic Performance
(2024)OrganometallicsThe reason for the discrepancy in reaction rate in hydrogenation reactions using cyclopentadienone iron complexes as catalysts, depending on the absence or presence of a negative charge-tag (sulfonate or phosphonate), was investigated experimentally. Based on NMR and kinetic experiments, the direct binding of the charge-tag to the active site of the catalyst and electric field effects influencing transition state energies could be excluded. ...Journal Article -
A Ni(0) Methyl Complex Based on a Bimetallic Ni–Ga Framework
(2024)OrganometallicsThe Ni(0) methyl complex MeNiGaL was prepared and characterized by XRD, 1H NMR, 13C NMR, 31P NMR, ESI-MS, and UV–vis. The compound can be prepared from the 16-valence electron complex NiGaL by addition of MeLi, yielding the corresponding lithium salt. NiGaL is a close derivative of a complex that has been previously reported by Lu et al. The title compound represents a rare example of a Ni(0) alkyl complex. The complex is based on a ...Journal Article -
Unique corrosion behavior of an archaeological Roman iron ring: microchemical characterization and thermodynamic considerations
(2024)Corrosion ScienceThe corrosion mechanisms of a Roman iron bezel ring were investigated by in-depth characterization of its uncommon corrosion pattern and thermodynamic modelling. A silver foil and altered glass remnants were identified, covered with thick strata of magnetite and goethite. Underneath it, was a multi-millimetric cavity, filled with spheroidal magnetite or magnetite/goethite nodules in a siderite matrix. The bottom of the preserved object ...Journal Article -
Robustness of Threshold Collision-Induced Dissociation Simulations for Bond Dissociation Energies
(2024)The Journal of Physical Chemistry AThe threshold collision-induced dissociation (T-CID) method is the workhorse for gas-phase bond dissociation energy (BDE) measurements. However, T-CID does not measure BDEs directly; instead, BDEs are obtained by fitting simulated data to the experimental data. We previously observed several large discrepancies between the computed and experimental BDEs. To analyze the reliability of the experimental values, we previously reported a study ...Journal Article -
Nitrogen availability and plant functional composition modify biodiversity‐multifunctionality relationships
(2024)Ecology LettersBiodiversity typically increases multiple ecosystem functions simultaneously (multifunctionality) but variation in the strength and direction of biodiversity effects between studies suggests context dependency. To determine how different factors modulate the diversity effect on multifunctionality, we established a large grassland experiment manipulating plant species richness, resource addition, functional composition (exploitative vs. ...Journal Article -
eProbe: Sampling of Environmental DNA within Tree Canopies with Drones
(2024)Environmental Science & TechnologyEnvironmental DNA (eDNA) analysis is a powerful tool for studying biodiversity in forests and tree canopies. However, collecting representative eDNA samples from these high and complex environments remains challenging. Traditional methods like surface swabbing or tree rolling are labor-intensive and require significant effort to achieve adequate coverage. This study proposes a novel approach for unmanned aerial vehicles (UAVs) to collect ...Journal Article -
Temporal variations of carbon and water fluxes in a subtropical mangrove forest: Insights from a decade-long eddy covariance measurement
(2023)Agricultural and Forest MeteorologyMangroves, highly efficient ecosystems in sequestering CO2, are strongly impacted by climate change. The lack of long-term observation in mangroves hinders the evaluation of seasonal and inter-annual variability in carbon and water fluxes and their responses to various environmental drivers. In this study, we measured net ecosystem CO2 exchange and evapotranspiration between the atmosphere and subtropical mangroves using the eddy covariance ...Journal Article -
Animal-associated marine Acidobacteria with a rich natural-product repertoire
(2023)ChemSponges are well known as rich sources of bioactive natural products. Various studies suggest that many of these compounds are produced by symbiotic bacteria. However, substance supplies and functional insights about the producers remain limited because cultivation remains unsuccessful. To identify alternative, sustainable sources of sponge-derived polyketides, we computationally analyzed 5,289 characterized and orphan trans-acyltransferase ...Journal Article