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Showing 1 to 20 of 85 for “"Metal atoms"”.
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Spin coherence and optical properties of alkali-metal atoms in solid parahydrogen
Trapped gas phase atoms and molecules are the leading experimental platformsfor applications such as quantum computation, quantum sensing, and tests of fundamental physics. There is active research in solid-state electron spin systems for these applications. Nitrogen-vacancy centers in diamond, …
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A Matrix Isolation Spectroscopic Investigation Into the Reaction Products of Vanadium Metal Atoms With Propene
The products of vanadium metal atom reactions with propene and some propene isotopomers (propene-d6 and propene-3,3,3-d3) are investigated using FT-IR matrix isolation. The major product from the condensation of V atoms with propene at elevated mole ratios is found to be propane (C3H8), the …
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Strategies to tune active site environments for alkene epoxidations with H2O2 over supported transition metal atoms
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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ACTIVATION OF AMMONIA, SECONDARY, AND TERTIARY AMINES BY GROUP IIA AND FIRST ROW MIDDLE AND LATE TRANSITION METAL ATOMS AND CLUSTERS
Activation of ammonia and amines occurs during metal vapor synthesis at cryogenic temperatures. The Group IIA metal atoms: magnesium, calcium, strontium, and barium, and the transition metal atoms: chromium, manganese, iron, cobalt, nickel, and zinc react with amines and ammonia. Copper metal atoms …
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An EPR and DFT investigation of the products formed in the reaction of group 11 metal atoms with three-membered heterocyclic compounds
Transition metals have been shown to be efficient catalysts in a variety of organic reactions. In particular, Group 11 metals have emerged as essential components in the carboxylation or metal-catalyzed ring expansion of three-membered heterocyclic compounds. Previous reports have speculated the …
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AUGER ELECTRON SPECTROSCOPY OF CRYOGENIC MATRIX ISOLATED METAL ATOMS AND DIRECT RECOIL SPECTROSCOPY (DRS), SIMS AND XPS STUDIES ON TITANIUM AND PIQ
Auger electron spectra of matrix-isolated metal atoms have been recorded for the first time. Differences in extra-atomic relaxation between bulk metal and argon matrix isolated atoms resulted in shifts in the energy of LMM Auger electrons, $-3.1$ eV for potassium and $-8.7$ eV for titanium. The sum …
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Modeling and Measurements of an Ionized Physical Vapor Depositon Device Plasma
… was used to model the transport of sputtered atoms through the IPVD system. The simulation combines Monte Carlo and fluid methods to track the metal atoms that are emitted from the target, interact with the IPVD plasma, and are eventually deposited somewhere in the system. Ground-state …
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ELECTRONIC MATRIX ISOLATION SPECTROSCOPIC STUDIES OF METAL ATOM PHOTOCHEMISTRY
… molecular scale interactions of the 1:1 metal-water adduct are investigated utilizing electronic absorption spectroscopy, and (3) molecular orbital and electronic state-to-state correlations are invoked to interpret the chemical reaction dynamics of the adducts along ground and excited …
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Conditions for Observing Infrared Chemiluminescence and the Role of Condensation in Metal Oxidation Reactions
Infrared chemiluminescence (IRCL) studies of cw metal oxidation reactions wherein metal atoms entrained in a carrier gas were mixed with an oxidizer by means of a nozzle system are described. One goal of the work was to determine the vibrational distribution of the product molecule produced by the …
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Some metal complexes of dihydroxycyclobutenedione
… and chemical properties of the trivalent metal squarate complexes of iron, vanadium, and indium in order to determine their structure. In this investigation studies were made of the infrared spectra, electronic spectra, x-ray diffraction powder photographs and diffractometer patterns, …
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Fundamental Understanding of Palladium-Based Catalysts: From Pyrene-Based COFs to Size-Controlled Bimetallic Nanostructures
The catalytic properties of single atoms (SAs) have attracted growing attention due to their unique electronic characteristics and their ability to maximize atomic efficiency compared to nanoparticles. As particle size decreases, the coordination environment around the metal atoms becomes …
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Experimental and Theoretical Analysis of the Luminescence Spectroscopy of atomic Mercury and atomic Manganese isolated in Rare Gas Solids
… into the optical spectroscopy of atomic ns2 metal atoms, mercury and manganese isolated in cryogenic thin films of rare gases argon, krypton and xenon. The luminescence spectroscopy of solid-state M/RG (M = Hg and Mn; RG = Ar, Kr and Xe) samples has been recorded employing both …
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Functional Metal Phosphonates
… was the incorporation of functionality into metal phosphonates. This was done in one of several ways. The first involved using phosphonate ligands that had covalently attached organic functional groups. In some cases, these ligands undergo reactions during the solvothermal syntheses which can …
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Studies of Solution Paramagnetic-Substrate Nuclear and Electron Intermolecular Interactions
… the relaxivity properties of water-soluble trimetallic nitride template functionalized endohedral metallofullerenes (TNT-fMF). The attitude and average distance of interaction for each TEMPO-substrate system was determined from comparing density functional theory (DFT) calculation results with …
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Crystallographic, Morphological and Kinetic Studies of the Alpha-Beta Transformation in the Niobium-Hydrogen System
The group VB bcc metal-hydrogen systems have been extensively studied in the last few years. These studies are relevant to nuclear-reactor technology, superconductivity, and energy storage devices. The elements nitrogen and hydrogen form interstitial solid solutions with the group VB bcc metals and …
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Sonoluminescence as a probe of acoustic cavitation
… lines correspond to atomic emission from the metal atoms. The intensity of sonoluminescence from Cr(CO)$\sb6$ was studied as a function of dissolved gases to determine the effect of thermal conductivity and $\gamma$ (C$\sb{\rm p}$/C$\sb{\rm v}$) on cavitational conditions. As predicted by …
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Surface Oxidation and Dissolution of Metal Nanocatalysts in Acid Medium
… is concluded that the dissolution mechanism of metal atoms involves: 1) Surface segregation of alloy atoms, 2) oxygen absorption into the subsurface of the catalyst, and 3) metal detachment through the interaction with ions in the solvent. Therefore, to improve the durability of platinum-based …
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Towards a fullerene-based nanotechnology: The (10,10) tube
… (SWNTs) in the presence of certain transition metal SWNT catalysts. Due to the high carbon to metal ratio in the vapor will the early stages of condensation, even in the presence of a SWNT catalyst, be characterized by an abundance of all-carbon fullerene-precursors. Metal atoms will then …
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STABILITY AND SPECTROSCOPIC PROPERTIES OF NEGATIVE IONS
… blocks of salts and oxidizing agents. Halogen atoms, due to their ability to attract electrons, readily form negative ions. Considerable interest exists in the design and synthesis of new negative ions called superhaogens whose electron affinities are much higher than those of halogen atoms. …
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