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Displaying 151 - 175 of 3755

Metal-Assisted Hydrogen Storage on Pt-Decorated Single-Walled Carbon Nanohorns

June 23, 2012
Author(s)
Yun Liu, Craig M. Brown, Dan A. Neumann, David B. Geohegan, Alexander A. Puretzky, Christopher M. Rouleau, Hui Hu, David Styers-Barnett, Pavel O. Krasnov, Boris I. Yakobson
… Current methods to study the spillover effect in hydrogen storage materials typically must compare the results … to determine with confidence the amount of adsorbed hydrogen only associated with spillover. We propose two … pressure gas adsorption experiments to distinguish between hydrogen adsorbed due to physisorption and hydrogen adsorbed …

Substrate Specificity of the Ogg1 Protein of Saccharomyces Cerevisiae: Excision of Guanine Lesions Produced in DNA by Ionizing Radiation- or Hydrogen Peroxide/Metal Ion-Generated Free Radicals

January 1, 1998
Author(s)
B. Karahalil, P M. Girard, S Boiteux, M. Dizdaroglu
… Guanine Lesions Produced in DNA by Ionizing Radiation- or Hydrogen Peroxide/Metal Ion-Generated Free Radicals … Guanine Lesions Produced in DNA by Ionizing Radiation- or Hydrogen Peroxide/Metal Ion-Generated Free Radicals …

Microstructure and hydrogen bonding in water-acetonitrile mixtures

November 19, 2010
Author(s)
Raymond D. Mountain
… The connection between hydrogen bonding between water and acetonitrile in … simulated to determine the amount of water-acetonitrile hydrogen bonding. None of the six mixtures were able to reproduce the expermental estimates of hydrogen bonding derived from Raman scattering of the CN …

Performance of a C 60 + Ion Source on a Dynamic SIMS Instrument

July 1, 2006
Author(s)
Albert J. Fahey, John G. Gillen, P Chi, Christine M. Mahoney
… An IonOptika [1] C60+ ion source has been fitted onto a CAMECA [1] ims-4f. Stable ion beams of C60+ and C602+ have been obtained with typical … able to be focussed into a spot size of ~1 ?m and scanning ion images acquired. We have performed analyses to … Buckministerfullerene, cluster ion beams, ion source, SIMS ion source …

International Comparison CCQM-K41: Hydrogen Sulfide in Nitrogen

October 16, 2008
Author(s)
Franklin R. Guenther, Walter R. Miller Jr.
… the preparation and value assignment of gas standards for hydrogen sulfide in nitrogen, maintained at the participating … the cylinders could not be prepared gravimetrically as hydrogen sulfide may be absorbed onto the walls of the … laboratory also analyzed a stable reference, a hydrogen sulfide gas mixture that had been shown to be stable …

Noninvasive monitoring of ion current and ion energy during plasma processing

July 15, 2008
Author(s)
Mark A. Sobolewski
… technique has been developed for noninvasive monitoring of ion energy and ion current in plasma reactors. The technique relies on … electrical waveforms, the technique determines the total ion current, the plasma potential and sheath voltage … ion current, ion energy, electrical measurements, inductively …

Cold atomic beam ion source for focused ion beam applications

July 23, 2013
Author(s)
Brenton J. Knuffman, Adam V. Steele, Jabez J. McClelland
… We report measurements and modeling performed on an ion source based on ionization of a laser-cooled atomic beam. … for use in next-generation, high-resolution focused ion beam (FIB) systems. Our measurements of total ion current as a function of ionization conditions support a …

Inter-ion Coulomb interactions in a Magneto-Optical Trap Ion Source

May 19, 2011
Author(s)
Jabez J. McClelland, Brenton J. Knuffman, Adam V. Steele
… We have investigated the role played by inter-ion Coulomb interactions in a magneto-optical trap ion source (MOTIS). Using a Monte Carlo simulation accounting … MOTIS, ion beams, coulomb replusion … Inter-ion Coulomb interactions in a Magneto-Optical Trap Ion Source …

Ion-Molecule Reactions and Ion Energies in CF 4 Discharges

December 1, 1999
Author(s)
B. Peko, I. V. Dyakov, R. Champion, MVVS. Rao, James K. Olthoff
… E/N values ranging from 4 x 10 -18 V m 2 (4 to 25 kTd). Ion energy and ion intensity data for the Townsend discharges are analyzed … cross sections, dissociative charge transfer, ion energies, ion molecule reactions, Townsend discharge … Ion-Molecule Reactions and Ion Energies in CF 4 Discharges …

Reference measurements of Hydrogen's Dielectric Permittivity

August 10, 2009
Author(s)
James W. Schmidt, Michael R. Moldover, Eric F. May
… The measurements determine accurate values of hydrogen's molecular electric polarizability and its … calculated value 1.0×10 -5 K -1 . Our data also determine hydrogen's second dielectric virial coefficient, b ε,H2 = … dielectric constant, dielectric permittivity, helium, hydrogen …

Multifilmamentary Nb 3 Sn wires reacted in hydrogen gas

May 1, 2002
Author(s)
M Takayasu, R G. Ballinger, Ronald B. Goldfarb, A. A. Squitieri, P. J. Lee, David C. Larbalestier
… may be avoided by reacting in a reducing atmosphere of 5% hydrogen-95% argon. The effects of the hydrogen reaction on the superconductive properties of … the bronze wire and by 8% for the internal-tin wire by the hydrogen heat treatment, approximately proportional to the …

Ambient-Temperature Hydrogen Storage via Vanadium(II)-Dihydrogen Complexation in a Metal-Organic Framework

April 28, 2021
Author(s)
David Jaramillo, Henry Jiang, Hayden Evans, Romit Chakraborty, Hiroyasu Furukawa, Craig Brown, Martin Head-Gordon, Jeffrey Long
… of materials that strongly and reversibly adsorb hydrogen at ambient temperatures and moderate pressures could … optimal range of −15 to −25 kJ/mol for ambient-temperature hydrogen storage. Here, we report the hydrogen adsorption properties of the metal–organic framework …

Role of microstructure and composition in resisting hydrogen embrittlement of fastener grade steels

July 13, 2009
Author(s)
Nicholas Nanninga, Jack Grochowski, Lloyd Heldt, Karl Rundman
… The degree of hydrogen embrittlement for several fastener grade steels has … determined. The technique used to assess the resistance to hydrogen embrittlement of the steels was the rising step load … alteration resulted in some improvement in resistance to hydrogen embrittlement, the overriding factor contributing to …

High-brightness Cs focused ion beam from a cold-atomic-beam ion source

May 2, 2017
Author(s)
Adam V. Steele, Andrew Schwarzkopf, Jabez J. McClelland, Brenton Knuffman
… of focal spot size and brightness in a focused ion beam system utilizing a laser-cooled atomic beam source … than the highest brightness observed in a Ga liquid metal ion source. The behavior of brightness as a function of beam … as next-generation circuit edit and nanoscale secondary ion mass spectrometry. …

Photoluminescence Quenching in Si 1-x Ge x /Si Multiple Quantum Wells Grown With Atomic Hydrogen

March 1, 1999
Author(s)
Greg Balchin, Paul M. Amirtharaj, C Silvestre, P E. Thompson
… x /Si (0.1 {1-xGe x /Si MQW samples grown without atomic hydrogen. No quantum confined photoluminescence was observed … in the Si 1-x Ge x /Si MQW samples grown with atomic hydrogen. This was unexpected since quantum confined photoluminescence has been observed in the hydrogen-assisted growth of Si 1-x Ge x /Si quantum-well …

Magneto-Optical-Trap-Based, High Brightness Ion Source for Use as a Nanoscale Probe

August 21, 2008
Author(s)
James L. Hanssen, Shannon B. Hill, Jon Orloff, Jabez J. McClelland
… on the demonstration of a low emittance, high brightness ion source based on magneto-optically trapped neutral atoms. Our source has ion optical properties comparable to or better than those of the commonly used liquid metal ion source. In addition, it has several advantages that offer …

Ion Solvation in Water Acetonitrile Mixtures

January 1, 2001
Author(s)
Raymond D. Mountain
… The results of a preliminary molecular dynamics study of ion (NA+ and Cl-) solvation and association in water, … is expected to be an important factor governing ion solvation and association. Results for ions in pure water … than the temperature in determining the degree of ion association. Preliminary results for the mixtures are …

In-situ Kinetics Studies on Hydrogenation of Transition Metal (=Ti, Fe) Doped Mg Films

March 1, 2010
Author(s)
Zhuopeng Tan, Edwin J. Heilweil, Leonid A. Bendersky
… Ti and Fe additives on Mg hydride growth rates. Compare to hydrogenation of pure Mg, Ti additives (atomic fraction 1.6 % … a thicker hydride layer residing on top of the films. Mg Hydrogenation rate is increased by an order of magnitude for … layer is thicker than twice of the hydride layer in hydrogenation of pure Mg case. Results obtained here can be …

Assessing girth weld quality of pipeline steels and their susceptibility to hydrogen embrittlement

June 16, 2024
Author(s)
Zack Buck, Newell Moser, May Ling Martin, Nicholas Derimow, Damian Lauria, Enrico Lucon, Douglas Stalheim, Peter Bradley, Matthew Connolly
… Hydrogen is known to cause premature failure in various steel … understanding the susceptibility of these steels to hydrogen embrittlement and the effect of various … results of mechanical measurements performed in air and in hydrogen of girth welds used in pipeline steels. Fracture …

Alkali metal pyridinolate/piperidinolate pairs: A new type of materials for efficient reversible hydrogen storage

April 1, 2025
Author(s)
Alexis Munyentwali, Yang Yu, Xingchi Zhou, Wei Zhou, Qijun Pei, Khai Chen Tan, Anan Wu, Hui Wu, Teng He, Ping Chen
… Chemical hydrogen storage in organic materials is a promising method … This study proposes a strategy to design a new type of hydrogen storage materials, i.e., alkali metal … suitable dehydrogenation thermodynamics along with high hydrogen storage capacities. These air-stable compounds can …

Micro-fabricated stylus ion trap

August 7, 2013
Author(s)
Kyle S. McKay, Christian L. Arrington, Ehren D. Baca, Jonathan J. Coleman, Yves Colombe, Patrick Finnegan, Dustin A. Hite, Andrew E. Hollowell, Robert Jordens, John D. Jost, Dietrich G. Leibfried, Adam M. Rowen, Ulrich J. Warring, David J. Wineland, David P. Pappas, Andrew C. Wilson
… stylus Paul trap was designed to confine a single atomic ion for use as a sensor to probe the electric-field noise of … with the UV-LIGA technique to reduce the distance of the ion from the surface of interest. We detail the fabrication … environment. After cooling a motional mode of the ion at 4 MHz close to its ground state (n = 0.34 � 0.07), the …

Advances in source technology for focused ion beam instruments

April 1, 2014
Author(s)
Noel Smith, John Notte, Adam V. Steele
… Owing to the development of new ion source technology, users of focused ion beams (FIBs) have an increasingly wide array of uniquely … capable platforms to choose from. Specifically, the new ion sources are able to offer superior performance in several … ion sources, focused ion beams, inductively coupled plasma, …
Displaying 151 - 175 of 3755
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