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Showing 1 to 20 of 92 for “"hydrogen atoms"”.
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Calculations for charge-transfer in collisions of triply-ionized nitrogen and doubly-ionized sulphur with hydrogen atoms
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-27T14:28:46Z No. of bitstreams: 1 1980_christensen.pdf: 4732068 bytes, checksum: 8660538e8ef435236d68b745f3b846da (MD5)
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Charge Transfer Cross-Sections for Nitrogen(v) and Sulfur(iii) Ions Interacting With Hydrogen Atoms in Astrophysical Plasmas
… the reactive cross sections involving neutral hydrogen and helium are not generally available. In the absence of such values, one must rely on theoretical calculations of the relevant reaction rates.
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Charge transfer cross-sections for N V and S III ions interacting with hydrogen atoms in astrophysical plasmas
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T16:16:05Z No. of bitstreams: 1 1983_feickert.pdf: 4061766 bytes, checksum: 84661d96346e5c8896ea444768dd1395 (MD5)
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Ignition and flameholding in supersonic flow by injection of dissociated hydrogen
… of radicals to a stoichiometric mixture of hydrogen and air was performed using a finite-rate chemical kinetics code. The results of these calculations indicate that small additions of hydrogen atoms, oxygen atoms, nitrogen atoms, or hydroxyl radicals are effective in promoting ignition. …
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The SRN1 reactivity of halobenzenesulfonamides and related compounds
… the substitution reaction. The presence of β-hydrogen atoms was a common structural feature of ketones used in reactions in which reduction competed with substitution. It was also observed that the amount of reduction product isolated increased as a function of the number of β-hydrogen atoms …
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Photochemistry of medium and large membered ring diketones in both the solution and crystalline state
… most compounds investigated underwent smooth γ-hydrogen abstraction. The stereoelectronic requirements for the γ-hydrogen atom abstraction and the reactivity differences observed in the solid and solution reactions have been investigated with the help of X-ray crystallography and molecular …
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A Monte Carlo Approach to Studying the Hydrogen Storage Capabilities of Potassium Magnesium Hydride (KMgH3)
… temperatures and pressures in the study of the hydrogen storage capabilities of KMgH3. A specially tailored addition/removal algorithm was employed to add hydrogen directly at the lattice sites. Agreement between experimental results was obtained through GCMC simulations. WHAM type studies were …
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One-dimensional hydrogen atom
The photoionization spectrum of highly excited hydrogen atoms in the energy range between E = 0 and E = E$\sb{\rm c}$ ionization thresholds is examined in the presence of a strong dc electric field. Atomic hydrogen is excited from the ground state via a three-photon process to high-lying excited …
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One-dimensional hydrogen atom
The photoionization spectrum of highly excited hydrogen atoms in the energy range between E = 0 and E = Ec ionization thresholds is examined in the presence of a strong de electric field. Atomic hydrogen is excited from the ground state via a three-photon process to high-lying excited states. …
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Microstructure-informed modeling of hydrogen diffusion in zirconium polycrystals
… water coolant reacts with zirconium and releases hydrogen atoms that ingress into the lattice of the metal alloy. With time, hydrogen concentration exceeds its terminal solid solubility limit in zirconium, and a brittle phase known as zirconium hydride forms. This phase severely deteriorates the …
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Aminodiboranates: syntheses, structures, and applications for chemical vapor deposition
… The thorium center forms bonds with fifteen hydrogen atoms; accordingly, this is the first example of a fifteen-coordinate atom of any kind. As determined by both single crystal X-ray and single crystal neutron diffraction studies, the eight boron atoms describe an approximate D₂d …
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Mechanism of the hydropyrolysis of Manvers coal
… various pressures of nitrogen (pyrolysis) and hydrogen (hydropyrolysis). All products were investigated. Pyrolysis of coals involves the transfer of hydrogen atoms from one part of their structure to another. In the above experiments there was no way of labelling the hydrogen or of …
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Ionisation in Flames with Additives
… concentrations of electrons, positive ions and hydrogen atoms, have been measured using the microwave resonant cavity, the rotating electrostatic probe and the spectrophotometer, respectively, to investigate the effect of phosphorus on both the charged and the neutral species. Phosphorus has …
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Electrical and mechanical properties of molecular junctions and nano surfaces
… in terms of stiffness and work function as the hydrogen concentration intercalating the interface and the number of graphene sheets on top of the silicon-carbide substrate varies. As a result of this study I have found that the effect of increasing the number of penetrating hydrogen atoms is to …
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Elementary processes in alkane-based reactive ion etching of III-V semiconductors
… the damage, removal was effected by exposure to hydrogen ions. Similar results were observed when these semiconductors were exposed to low energy methyl ions (<100 eV), except that the deposited amorphous hydrocarbon was readily removed by ozone oxidation treatments. Methyl radicals are suspected …
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Synthesis and Characterization of Highly Porous Borazine-Linked Polymers via Dehydrogenation/Dehydrocoupling of Borane-Amine Adducts and Their Applications to Gas Storage
… and successfully synthesized by thermal dehydrogenation of several polytopic arylamine-borane adducts and has been designated Borazine-Linked Polymers (BLPs). The polymers reported are constructed of linear, triangular, and tetrahedral amine building units to form 2D and 3D frameworks. The …
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Long-range interatomic interactions: Oscillatory tails and hyperfine perturbations
… study the long-range interaction between two hydrogen atoms, in both the van der Waals and Casimir-Polder regimes. The retardation regime is reached when the finiteness of the speed of light becomes relevant. Provided that both atoms are in the ground states, the retardation regime is achieved …
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EVOLUTION AND CHARACTERIZATION OF A NEW REVERSIBLY PHOTOSWITCHABLE CHROMOPROTEIN
… neutron structure shows the location of critical hydrogen atoms, and reveals the position, orientation, and protonation states of solvent molecules in the chromophore and surrounding amino acids, which have not been ascertained to date from current X-ray structures. We report 1.65 \xc5 ground …
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Rapid identification, confirmation, and quantitation using an open-air ion source coupled to a time-of-flight mass spectrometer
… due to the interactions of helium metastable atoms with gas molecules commonly found in air. The coupling of the DART to a time-of-flight (TOF) mass spectrometer allows the rapid determination of an analyte's elemental composition based on accurate mass measurement and isotope peak …
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