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Displaying 226 - 250 of 3840

Hydrogen Dynamics in the Hexagonal Ho 2 Fe 17 H 4 and Y 2 Fe 17 H 4.2 : Inelastic and Quasielastic Neutron Scattering Studies

May 28, 2017
Author(s)
A. V. Skripov, O. Isnard, N. V. Mushnikov, P. B. Terent'ev, V. S. Gaviko, Terrence J. Udovic
… The vibrational spectra of hydrogen and the parameters of H jump motion in the hexagonal … and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ho(Y) 2 Fe 2 sites in … meV, respectively. For Ho 2 Fe 17 H 4 , the localized hydrogen jump motion is found to be the fastest among all R 2 …

Direct Observation of Hydrogen Spillover in Ni-Loaded Pr-Doped Ceria

January 17, 2012
Author(s)
Vaneet Sharma, Peter A. Crozier, Renu Sharma, James B. Adams
… Hydrogen-spillover in Ni-loaded Pr-doped ceria (PDC) was … in terms of surface diffusion properties of atomic hydrogen and oxygen species. … In situ, Pr-doped ceria, reduction zone, hydrogen spillover, ETEM … Direct Observation of Hydrogen Spillover in Ni-Loaded Pr-Doped Ceria …

The Use of an SF5+ Primary Ion Beam for Ultra Shallow Depth Profiling on an Ion Microscope SIMS Instrument

October 16, 2008
Author(s)
J Greg Gillen, Marlon L. Walker, P E. Thompson, J Bennett
… has been fitted with a modified hot filament duoplasmatron ion source for generation of SF 5 + primary ion beams for SIMS depth profiling applications. The SF 5 + primary ion beam has been evaluated by depth profiling of several low … polyatomic primary ions, secondary ion mass spectrometry, sulfur hexafluoride, ultra shallow …

Direct Observation of Activated Hydrogen Binding to a Supported Organometallic Compound at Room Temperature

April 2, 2012
Author(s)
Jason M. Simmons, Taner Yildirim, Ahmad Hamaed, David M. Antonelli, Michael I. Webb, Charles J. Walsby
… been proposed as a means of achieving room temperature hydrogen storage via Kubas interactions, however there is … theory, we provide direct evidence for Kubas-like metal-hydrogen interactions in a silica-supported Ti(III) … predictions of the efficacy of Kubas bonding for improved hydrogen storage materials. …

Laser Cooling of Trapped Ions

January 1, 1991
Author(s)
Wayne M. Itano, James C. Bergquist, John J. Bollinger, David J. Wineland
… Fermi Summer School, Laser Manipulation of Atoms and Ions … Enrico Fermi Summer School, Laser Manipulation of Atoms and Ions … Laser Cooling of Trapped Ions …

Determining Steel Weld Qualification and Performance for Hydrogen Pipelines: Phase I Report

May 23, 2023
Author(s)
Matthew Connolly, May Ling Martin, Zack Buck, Newell Moser, Enrico Lucon, Damian Lauria, Peter Bradley, Andrew Slifka, Robert Amaro
… "Determining Steel Weld Qualification and Performance for Hydrogen Pipelines". In this work, the goals of Phase I were … review of steel weld qualification and performance for hydrogen pipelines, 2) to form a committee of industry and … approach to determining weld and HAZ performance for hydrogen pipelines: 1) survey industry for a wide spectrum of …

Mobilities of aromatic ions drifting in helium

October 12, 2021
Author(s)
M Krishnamurthy, J A. de Gouw, V M. Bierbaum, S R. Leone
… tube (SIFDT) apparatus. The reduced mobilities of these ions in helium are measured as a function of the … in the drift tube). The reduced mobilites of the dimer ions are compared with the measured mobilities of naphthalene … cross sections computed from the geometric structures of ions using a hard sphere model. The results suggest that the …

Transport of Quantum States and Separation of Ions in a Dual RF Ion Trap

September 1, 2002
Author(s)
Mary A. Rowe, A. Ben-Kish, B. DeMarco, D. Leibfried, V. Meyer, James A. Beall, J. Britton, J. Hughes, Wayne M. Itano, Branislav M. Jelenkovic, C. Langer, T. Rosenband, David J. Wineland
… We have investigated ion dynamics associated with a dual linear ion trap where ions can be stored in and moved betweenn two distinct … coherence. In addition, we have separated two ions held in a common trap into two distinct traps. … quantum computation, quantum state engineering, trapped ions …

Understanding and Mitigating the Effects of Stable Dodecahydro-closo-dodecaborate Intermediates on Hydrogen Storage Reactions

October 25, 2016
Author(s)
James L. White, Rebecca J. Newhouse, Jin Z. Zhang, Terrence J. Udovic, Vitalie Stavila
… Alkali metal borohydrides can reversibly store hydrogen; however, the materials display poor cyclability, … effort to understand the role of such intermediates on the hydrogen storage properties of metal borohydrides, several … or borides, albeit under rather harsh conditions of hydrogen pressure and temperature. …

Quantum Logic Spectroscopy with Ions in Thermal Motion

April 16, 2020
Author(s)
Daniel Kienzler, Yong Wan, Stephen Erickson, Jenny Wu, Andrew C. Wilson, David J. Wineland, Dietrich Leibfried
… for implementing quantum logic spectroscopy on trapped ions, which combines probe and information transfer from the … quantum logic, spectroscopy, trapped ions … Quantum Logic Spectroscopy with Ions in Thermal Motion …

Intramolecular Versus Intermolecular Hydrogen Bonding in the Adsorption of Aromatic Alcohols Onto an Acrylic Ester Sorbent

October 16, 2008
Author(s)
K L. Mardis, B J. Brune, P Vishwanath, B Giorgis, G F. Payne, M K. Gilson
… Intramolecular hydrogen bonds influence the intermolecular binding … Understanding the competition between the two types of hydrogen bonds may result in the ability to design separation … are examined to determine the effect of intramolecular hydrogen bond formation on the binding to ethyl propionate …

S and Si Ion-Implantation in GaSb Grown on GaAs

December 1, 1999
Author(s)
M V. Rao, A K. Berry, T Q. Do, M C. Ridgway, P Chi, J Waterman
… Single and multiple energy S and Si ion-implantations were performed at room temperature (RT) and … with a Si 3 N 4 cap at 400-600 C for 5 min. Secondary ion mass spectrometry measurements indicated thermal … doping, ion-implantation, secondary ion mass spectrometry …

Fast transport of mixed-species ion chains within a Paul trap

November 6, 2014
Author(s)
Ryan S. Bowler, M. Palmer, John P. Gaebler, Dietrich G. Leibfried, J. G. Ceremuga
… We investigate the dynamics of mixed-species ion crystals during transport between spatially distinct … show how to extend this approach to longer mixed-species ion strings. Fast transport of mixed-species ion strings can significantly reduce the time overhead in …

The Role of Hydrogen Bonding in Transition-State Stabilization by Uracil-DNA Glycosylase

February 1, 2000
Author(s)
A C. Drohat
… Escherichia coliuracil DNA glycosylase (UDG) provides a hydrogen bond from a neutral His187 to stabilize the … s-1 and P.F. = 500), and change in 15N chemical shift upon hydrogen bond formation (D d = 10 ppm) indicatethat this is a fairly strong, short hydrogen bond. These findings suggest a general mechanism for …

Fine Tuning and Specific Binding Sites with a Porous Hydrogen-Bonded Metal-Complex Framework for Gas Selective Separations

May 14, 2018
Author(s)
Zongbi Bao, Danyan Xie, Ganggang Chang, Hui Wu, Liangying Li, Wei Zhou, Hailong Wang, Zhiguo Zhang, Huabin Xing, Qiwei Yang, Michaek J. Zaworotko, Qilong Ren, Banglin Chen
… and functional properties are extremely rare due to weak hydrogen-bonding interactions among molecular organic linkers … both the moderately stable coordination bonds in MOFs and hydrogen bonds, we have realized a microporous hydrogen-bonded metallotecton framework HOF -21 , which not …

Individual Ion Addressing with Microwave Field Gradients

April 26, 2013
Author(s)
Ulrich J. Warring, C. Ospelkaus, Yves Colombe, Robert Jordens, Dietrich G. Leibfried, David J. Wineland
… ion cooling, ion trapping, mechanical effects of light on ions, quantum … Individual Ion Addressing with Microwave Field Gradients …

Hot carriers in epitaxial graphene sheets with and without hydrogen intercalation: role of substrate coupling

July 1, 2014
Author(s)
Randolph E. Elmquist, Chiashain Chuang, Yanfei Yang, Lung-I Huang, Chi-Te Liang
… sheets on 6H-SiC (0001) substrates with and without hydrogen intercalation by driving the device into the … that the energy relaxation time of the device without hydrogen intercalation is two orders of magnitude shorter than that with hydrogen intercalation, suggesting applications of epitaxial …

Secondary Ion Mass Spectrometry Using Cluster Primary Ion Beams

January 1, 2003
Author(s)
John G. Gillen, Albert J. Fahey
… for conducting cluster SIMS experiments on both our ion microscope and TOF-SIMS instruments. This paper will review our recent work on cluster ion source development, elemental depth profiling with cluster primary ion beams and the use of cluster ion beams for organic …

In Situ Neutron Transmission Bragg Edge and Synchrotron X-Ray Measurement of Strain Fields Near Fatigue Cracks Grown in Hydrogen

April 18, 2018
Author(s)
Matthew J. Connolly, Peter E. Bradley, Damian S. Lauria, Andrew J. Slifka, Elizabeth S. Drexler
… fatigue crack growth rate of metals in the presence of hydrogen is a long-standing problem. In an effort to determine the dominate damage mechanism behind hydrogen assisted fatigue crack growth, we performed … fields near cracks grown both in air as well as in a hydrogen environment. An enhancement in the magnitude and …

Precise Calculation of Transition Frequencies of Hydrogen and Deuterium Based on a Least-Squares Analysis

October 11, 2005
Author(s)
U Jentschura, Svetlana A. Kotochigova, E-O Le Bigot, Peter J. Mohr, Barry N. Taylor
… Theoretical values of transition frequencies of hydrogen and deuterium are given, based on the most accurate … deuterium, energy levels, hydrogen, hydrogenic spectrum, least-squares analysis, … Precise Calculation of Transition Frequencies of Hydrogen and Deuterium Based on a Least-Squares Analysis …

Towards a Predictive, Physics-Based Model of Hydrogen-Assisted Fatigue Crack Growth: Measurements of Strain Fields and Isotope Effects

November 10, 2016
Author(s)
Matthew Connolly, Andrew Slifka, Elizabeth S. Drexler
… A predictive, physics-based model of hydrogen-assisted fatigue crack growth in pipeline steel is … a model with physical data, namely crack tip strains and hydrogen diffusion rates. In this paper, we present … deformation near cracks grown via fatigue in air and in a hydrogen environment. Drastic differences in both magnitude …

Trapped-Ion State Detection through Coherent Motion

December 9, 2011
Author(s)
Till P. Rosenband, David Hume, Chin-Wen Chou, David R. Leibrandt, Michael J. Thorpe, David J. Wineland
… is the ability to detect the state of an individual ion. Current detection techniques 3–6 are applicable only to … coherent motion that can be applied to a larger class of ion systems. We couple a “spectroscopy” ion to a “control” ion in the same trap via mutual Coulomb …
Displaying 226 - 250 of 3840
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