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Search Publications

NIST Authors in Bold

Displaying 201 - 225 of 3755

Evidence for multiple mechanisms underlying surface-electric field noise in ion traps

December 27, 2018
Author(s)
J. A. Sedlacek, J. Stuart, Daniel Slichter, C. D. Bruzewicz, R. McConnell, J. M. Sage, J. Chiaverini
… Energetic ion bombardment, or ion milling, of ion-trap electrode surfaces has previously been shown to … Here, using motional heating of a single trapped strontium ion, we investigate the temperature dependence of this noise … anomalous heating, electric field noise, ion milling, ion trap …

Delicate Tuning of Reaction Thermodynamics via Formation of Bimetal Phenoxide: Synthesis, Structure, and Hydrogen Storage Performance

May 2, 2025
Author(s)
Nor I. Nordin, Khai C. Tan, Hong Wen, Xiaohua Ju, Wei Zhou, Hui Wu, Teng He, Ping Chen, Yong Chua
… Arene-cycloalkane pairs are promising for hydrogen storage but often encounter unfavorable … bimetal organic compounds show potential for vehicular hydrogen storage, demonstrating efficient hydrogen uptake at 90 °C and partial reversibility at 140 °C. … phenoxide, hydrogen storage, X-ray crystallography …

Mobilities and Formation Kinetics of NH 4 + (NH 3 ) n Cluster Ions (n=0-3) in helium and helium/ammonia mixtures

January 1, 1997
Author(s)
M Krishnamurthy, J A. de Gouw, L N. Ding, V M. Bierbaum, S R. Leone
… NH 4 + (NH 3 ) n (n=1-3) cluster ions are formed in a field free flow tube section of a … measurements. The zero-field mobilities of the cluster ions in helium (22.1 +or-}0.3 cm 2 V -1 s -1 for NH 4 + , … of the geometric cross sections of the different cluster ions. The zero-field mobilities of NH 4 + (0.94 +or-} 0.15 cm …

Microfabricated Chip Traps for Ions

April 12, 2011
Author(s)
Jason Amini, Joseph W. Britton, Dietrich G. Leibfried, David J. Wineland
… ions, traps, microfabrication … Microfabricated Chip Traps for Ions …

Spectroscopic Identification of Hydrogen Spillover Species in Ruthenium-modified High Surface Area Carbons by Diffuse Reflectance Infrared Fourier Transform Spectroscopy

December 17, 2012
Author(s)
Jeffrey L. Blackburn, Chaiwat Engtrakul, Justin B. Bult, Katherine Hurst, Yufeng Zhao, Qiang Xu, Philip A. Parilla, Lin J. Simpson, John-David R. Rocha, Matthew Ross Hudson, Craig Brown, Thomas Gennett
… for their potential application within vehicular hydrogen storage applications. One method by which sorbents have been reported to store appreciable hydrogen at room temperature is via a spillover process: where molecular hydrogen is first dissociated by metal nanoparticle catalysts …

A Focused Chromium Ion Beam

October 21, 2010
Author(s)
Adam V. Steele, Brenton J. Knuffman, Jabez J. McClelland, Jon Orloff
… With the goal of expanding the capabilities of focused ion beam microscopy and milling systems, we have demonstrated … of chromium ions produced in a magneto-optical trap ion source (MOTIS). Neutral chromium atoms are captured into … to energies between 0.5 keV and 3 keV. The accelerated ion beam is scanned with a dipolar deflector and focused onto …

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 …

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. …

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 …

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 …

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 …

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. …

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 …

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 …

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 …

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 …

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 …
Displaying 201 - 225 of 3755
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