Results 51 to 60 of about 19,154 (230)

On Metal Carbonyl Compounds in Catalytic Methanol Synthesis: Detection, Consequences, and Removal

Chemie Ingenieur Technik, EarlyView.
Deactivation of Cu/ZnO/Al2O3 catalysts by metal carbonyl compounds in the feed gas is a critical problem in catalytic methanol synthesis. We utilize PTR–MS to identify potential chemical sources, detect contamination in an in‐house CO gas line, and validate filter methods for removing these catalyst poisons before synthesis.
Florian Stappert, Daniel Laudenschleger, Tim Herrendorf, Julia Menten, Holger Ruland   +4 more
wiley   +1 more source

Electrostatically Tuning the Photodissociation of the Irgacure 2959 Photoinitiator in the Gas Phase by Cation Binding [PDF]

, 2020
Our paper reports a combined experimental and computational investigation of the electrostatic tuning of Irgacure 2959, a Norrish-type I photoinitiator, in the presence of bound cations (H+ , Li+ , Na+ , K+ , Zn2+ , Ca2+ and Mg2+).
Samuel, Marlton, Michelle, Coote, Nicholas, Hill, Benjamin I., McKinnon, Adam, Trevitt   +4 more
core   +2 more sources

Ultrahigh-density spin-polarized hydrogen isotopes from the photodissociation of hydrogen halides: new applications for laser-ion acceleration, magnetometry, and polarized nuclear fusion

Light: Science & Applications, 2021
Spin-polarized hydrogen: production by photodissociation A laser-based scheme to produce spin-polarized hydrogen (SPH) at much higher densities than conventional methods could create new opportunities in physics.
Alexandros K. Spiliotis, Michalis Xygkis, Michail E. Koutrakis, Konstantinos Tazes, Gregoris K. Boulogiannis, Chrysovalantis S. Kannis, Georgios E. Katsoprinakis, Dimitrios Sofikitis, T. Peter Rakitzis   +8 more
doaj   +1 more source

Confined Hot Carrier Cooling Via Excited‐State Energy Gap Engineering in Graphyne Carbon Allotropes

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
The excited‐state energy gap (EEG), regulated by the concentration of sp‐hybridized carbon, provides an effective handle for tuning electron–phonon coupling behavior. This design enables long‐lived confinement of hot carriers near the top of the EEG with controllable energy levels.
Fulong Dai, Zhaozhao Xiong, Yingcong Liu, Feiyu Cheng, Haochun Sun, Zhenfa Zheng, Jin Zhao, Zhuojian Liang, Zhuo Kang, Yue Zhang   +9 more
wiley   +1 more source

Isolated spin polarized hydrogen atoms as targets for laser-induced polarized electron acceleration

Frontiers in Physics
High density Spin Polarized Hydrogen (SPH) atoms, which can be prepared using UV dissociation of hydro-halide molecules, can be attractive as potential targets for laser ionization/acceleration schemes aiming to create high energy and high current ...
Dimitris Sofikitis, Marios G. Stamatakis, Dimitrios G. Papazoglou, Dimitrios G. Papazoglou, T. Peter Rakitzis, T. Peter Rakitzis   +5 more
doaj   +1 more source

Roles of UV light strength and auxiliary electric field in the photocatalytic degradation effect of organic contaminant

High Voltage, 2019
The accumulation of contaminants on the electrical devices could adversely affect the operation. The present work used photocatalytic functional material to coat on the surface of the electrical devices to prevent the influence of organic contamination ...
Lin YaoYu, Ma YanXiang, Bian XingMing, Sun PengCheng, Sun PengCheng   +4 more
doaj   +1 more source

Kinetic Study on the Reaction of Phenylperoxy Radicals With Nitric Oxide

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT Cavity ring‐down spectroscopy (CRDS) and quantum cascade laser absorption spectroscopy (QCLAS), in conjunction with pulsed laser photolysis, were employed to investigate the reaction between phenylperoxy radicals (C6H5O2) and nitric oxide (NO) at a temperature of 296 ± 4 K. The experiment was carried out under N2 as bath gas.
Maya Matsushita, Michiya Fujita, Kenichi Tonokura   +2 more
wiley   +1 more source

Cis–Trans Rotational Isomerism of Formic Acid, Sulfur, and Selenium Analogues and Their Dimers: Chemical Kinetics Under Interstellar Conditions

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT We present chemical kinetic rate constants for the cis to trans isomerisation or rotamerization of monomeric seleno‐, thio‐, and formic acids and that of three of their dimeric species, based on variational transition state theory and multidimensional tunneling calculations in the gas‐phase, from 10 K to 300 K. These provide, firstly, reliable
Judith Wurmel, John M. Simmie
wiley   +1 more source

Vibrationally excited molecular hydrogen production from the water photochemistry

Nature Communications, 2021
Understanding the source of vibrationally excited molecular hydrogen is an essential prerequisite for understanding the chemical evolution in the universe.
Yao Chang, Feng An, Zhichao Chen, Zijie Luo, Yarui Zhao, Xixi Hu, Jiayue Yang, Weiqing Zhang, Guorong Wu, Daiqian Xie, Kaijun Yuan, Xueming Yang   +11 more
doaj   +1 more source

Ion Activation Methods for Top‐Down Proteomics

Mass Spectrometry Reviews, EarlyView.
ABSTRACT Mass spectrometry (MS) has emerged as a premier method used to characterize the sequences of proteins. Top‐down proteomics aims to capture the multiple sources of structural diversity reflected in proteins, such as those that arise from alternative RNA splicing events or the addition of post‐translational modifications. Tandem MS (i.e., MS/MS)
Jada N. Walker, Jennifer S. Brodbelt
wiley   +1 more source