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Search Publications

NIST Authors in Bold

Displaying 226 - 250 of 3755

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 …

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 …

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 …

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 …

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 …

Hydrogen-Bonded Complexes in Chloroform: Affinity, Entropy, and Conformation

October 16, 2008
Author(s)
M S. Head, R Luo, J A. Given, M K. Gilson
… binding affinities to study a series of flat, triply hydrogen-bonding molecules in chloroform. Good agreement with … affinity, binding, entropy, free energy, hydrogen bond … Hydrogen-Bonded Complexes in Chloroform: Affinity, Entropy, …

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 …

Conformational Changes in Active and Inactive States of Human PP2C? characterized by Hydrogen/Deuterium Exchange-Mass Spectrometry

May 8, 2017
Author(s)
Sharlyn Mazur, Elyssia S. Gallagher, Subrata Debnath, Stewart R. Durell, Kyle Anderson, Lisa M. Jenkins, Ettore Appella, Jeffrey W. Hudgens
… and catalytically important. Here, we report the use of hydrogen/deuterium exchange-mass spectrometry and molecular … catalytic domain conformational change, human pp2c¿, hydrogen/deuterium exchange-mass spectrometry, magnesium … Active and Inactive States of Human PP2C? characterized by Hydrogen/Deuterium Exchange-Mass Spectrometry …

Precise Energies of Highly Excited Hydrogen and Deuterium

November 1, 2002
Author(s)
Svetlana A. Kotochigova, Peter J. Mohr, Barry N. Taylor
… The energy levels of hydrogen and deuterium atoms are calculated to provide … deuterium, energy levels hydrogen, quantum electrodynamics … Precise Energies of Highly Excited Hydrogen and Deuterium …

Highly Charged Ions

January 1, 2001
Author(s)
John D. Gillaspy
… some of the fundamental properties of highly charged ions, the methods of producing them (with particular emphasis … charge-dependence, electron beam ion traps, highly charged ions, laboratory astrophysics, nanotechnology, nuclear … Highly Charged Ions …

High Fidelity Transport of Trapped-Ion Qubits through an X-Junction Trap Array

April 17, 2009
Author(s)
Brad R. Blakestad, Aaron Vandevender, Christian Ospelkaus, Jason Amini, Joseph W. Britton, Dietrich G. Leibfried, David J. Wineland
… computational fidelity and increases the time required for ion recooling. Here, we report reliable transport of 9 Be + … atom trapping and cooling, computation, ion transport, ion trap array, ion trap junction, quantum computation, … High Fidelity Transport of Trapped-Ion Qubits through an X-Junction Trap Array …

Cold Neutron Activation Analysis, a Nondestructive Technique for Hydrogen Level Assessment in Zirconium Alloys

June 1, 2012
Author(s)
Rick L. Paul, Adrien Couet, Arthur Motta, Robert Comstock
… of a non-destructive technique to quantitatively assess hydrogen concentration in zirconium alloys. The technique, … and comparing the rate of detection of characteristic hydrogen gamma rays to that of gamma rays from matrix atoms. … a precision of mg.kg-1 (or wt.ppm). Very low levels of hydrogen (as low as 5wt.ppm) can be detected. Also, it is …

Quantum walk on a line for a trapped ion

October 30, 2009
Author(s)
Peng Xue, Barry Sanders, Dietrich Leibfried
… walk can be experimentally realized for a single trapped ion and how to interpolate between the quantum and random … of the quantum walk is manifested not only in the ion's position but also its phonon number, which makes an ion trap implementation of the quantum walk feasible. …

Evaluation of the Propensity of Niobium to Absorb Hydrogen During Fabrication of Superconducting Radio Frequency Cavities for Particle Accelerators

October 31, 2010
Author(s)
Richard E. Ricker, Ganapati R. Myneni
… the processing environment. If these reactions produce hydrogen at sufficient concentrations and rates, then hydrogen will be absorbed and diffuse into the metal. High hydrogen activities could result in supersaturation and the … absorption, diffusion, hydrogen, niobium, corrosion, fabrication, superconducting …

Alterations in Water Structure Induced by Guanidinium and Sodium Ions

November 1, 2004
Author(s)
Raymond D. Mountain, D Thirumalai
… as the concentration of ion is varied. We consider two ions, namely, sodium chloride and guanadinium chloride. As the concentration of sodium ions, Na^+, is increased the water structure is greatly … The differences in the interaction of these two ions with water as their concentration is varied are used to …

Trapped-Ion Quantum Logic Gates Based on Oscillating Magnetic Fields

August 29, 2008
Author(s)
Christian Ospelkaus, Christopher Langer, Jason Amini, Kenton R. Brown, Dietrich G. Leibfried, David J. Wineland
… and entangling multi-qubit quantum gates for trapped-ion quantum information processing (QIP). With fields … induced gates for realistic distances between the ion crystal and the electrode surface. … Trapped-Ion Quantum Logic Gates Based on Oscillating Magnetic Fields …

Reversible CO2 Hydrogenation, Neutron Crystallography, and Hydride Reactivity of a Triiridium Heptahydride Complex

April 1, 2025
Author(s)
Valeriy Cherepakhin, Van K. Do, Anthony J. Chavez, Jacob Kelber, Ryan Klein, Eric Novak, Yongqiang Cheng, Xiaoping Wang, Craig Brown, Travis J. Williams
… and even CF3SO3D, they find that complex 2-H catalyzes hydrogenation of CO2 to formate (TONIr = 9600) and reverse formic acid dehydrogenation (TONIr = 54 400). The hydrogenation operates via a reactive intermediate … inelastic neutron scattering, hydrogen carrier, CO2 hydrogenation, formic acid dehydrogenation …

Modelling the test methods used to determine material compatibility for hydrogen pressure vessel service

October 16, 2019
Author(s)
Christopher P. Looney, Matthew J. Connolly, Peter E. Bradley, Andrew J. Slifka, Robert L. Amaro
… strength higher than 950 MPa is to be approved for gaseous hydrogen service outside of the United States, the vessel … Contents standard. The specific section of interest for hydrogen service is ISO-11114-4, Test Methods for Selecting Steels Resistant to Hydrogen Embrittlement. The ISO standard allows the use of …

EUV Spectroscopy of Highly Charged Xenon Ions Created Using an Electron Beam Ion Trap

March 27, 2007
Author(s)
K Fahy, E Sokell, G O'Sullivan, A Aguilar, Joshua M. Pomeroy, Joseph N. Tan, John D. Gillaspy
… At the NIST Electron Beam Ion Trap (EBIT), extreme-ultraviolet spectra of xenon ions have been recorded using a flat-field spectrometer. The … clectron beam ion trap, Cowan code, EUV, extreme ultraviolet, highly charge ions, multiply charged ions, spectroscopy, Xenon …

PROMOTION OR INHIBITION OF HYDROGEN-AIR IGNITION BY IRON-CONTAINING COMPOUNDS

July 1, 2008
Author(s)
Gregory T. Linteris
… The ignition of stoichiometric and fuel-lean hydrogen-air mixtures near 1000 K was studied, for varying … of iron pentacarbonyl promotes or inhibits the ignition of hydrogen/air mixtures. The simulations show that iron … Hydrogen, fire safety, ignition, contaminants, iron …

Lithiated Primary Amine-A New Material for Hydrogen Storage

May 26, 2014
Author(s)
Juner Chen, Hui Wu, Guotao Wu, Zhitao Xiong, Ruiming Wang, Hongjun Fan, Wei Zhou, Bin Liu, Yongshen Chua, Xiahua Ju, Ping Chen
… of 150-250 Degree}C., showing potentials as a new type of hydrogen storage material. Structural analysis and … Dehydrogenation, lithiated amine, Crystal structure, hydrogen storage … Lithiated Primary Amine-A New Material for Hydrogen Storage …

Prospects for atomic clocks based on large ion crystals.

September 8, 2015
Author(s)
John J. Bollinger, Kyle Arnold, Elnur Haciyev, Chern Hui Lee, Eduardo Paez, M. D. Barrett
… feasibility of precision frequency metrology with large ion crystals. For clock candidates with a negative … small number of ions (3). These results hail a new era for ion-based atomic clocks, allowing them to achieve stability … atomic clocks, ion crystals, ion traps, optical frequency metrology, scalar …

EUV spectra of Rb-like to Ni-like dysprosium ions in an electron beam ion trap

August 12, 2014
Author(s)
Deirdre Kilbane, G. O'Sullivan, Yuri A. Podpaly, John D. Gillaspy, Joseph Reader, Yuri Ralchenko
… radiation emitted from highly-charged dysprosium ions was measured at the National Institute of Standards and Technology. The ions were created, trapped, and excited in an electron beam ion trap (EBIT), and the spectra were recorded with a … Dysprosium, spectra, extreme ultraviolet, electron beam ion trap …
Displaying 226 - 250 of 3755
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