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Search Publications

NIST Authors in Bold

Displaying 176 - 200 of 4257

Laser Cooled Atoms as a Focused Ion Beam Source

December 21, 2006
Author(s)
James L. Hanssen, Jabez J. McClelland, E Dakin, M Jacka
… We describe a method for creating a high quality focused ion beam with enhanced capabilities using an ion source based on laser-cooled neutral atoms in a … and trapped, and will allow unprecedented control over the ion emission, allowing, for example, the production of single …

The Role of Particles in the Inhibition of Counterflow Diffusion Flames by Iron Pentacarbonyl

January 1, 2002
Author(s)
M D. Rumminger, Gregory T. Linteris
… formation in counterflow diffusion flames inhibited by iron pentacarbonyl (Fe(CO) 5 ). Three CH 4 -O 2 -N 2 reactant … Fe(CO)5, flame inhibition, halon replacements, iron pentacarbonyl, metal oxides, nanoparticles, nucleation, … in the Inhibition of Counterflow Diffusion Flames by Iron Pentacarbonyl …

Local Structure of Cu in Cs8Na16Cu5Ge131 Type II Clathrate

January 8, 2009
Author(s)
Winnie K. Wong-Ng, Azzam Mansour, Matthew Beekman, George S. Nolas
… local structure of Cu and Ge in the Cs8Na16Cu5Ge131 type II clathrate. We show that the local structure parameters, … local structure, Type II clathrate, Cs8Na16Cu5Ge131, thermoelectric, XAS … Local Structure of Cu in Cs8Na16Cu5Ge131 Type II Clathrate …

The Apache/Linux Measurement Toolkit (ALMT) Using NIST-Developed Chip

June 15, 1999
Author(s)
D C. Tang, J H. Lin
… server that are included as part of the toolkit. MultiKron II performance measurement hardware is used to minimize the … results that show the effectiveness of the MultiKron II hardware when compared to software only solutions. … Apache, hybrid, Linux, MultiKron II, PCM …

Magnetic Field Effect on the Static Antiferromagnetic Order and Spin Excitations in Underdoped Iron Arsenide Superconductor BaFe 1.92 Ni 0.08 As 2

March 14, 2011
Author(s)
Miaoyin Wang, Huiqian Luo, Meng Wang, Song Xue Chi, Jose Rodriguez Rivera, Deepak Singh, Sung Chang, Jeffrey W. Lynn, Pengcheng Dai
… order and low-energy spin excitations in the underdoped iron arsenide superconductor BaFe 1.92 Ni 0.08 As 2 . At zero … Iron superconductor, spin dynamics, spin resonance, field … Antiferromagnetic Order and Spin Excitations in Underdoped Iron Arsenide Superconductor BaFe 1.92 Ni 0.08 As 2 …

Preparation of Dicke States in an Ion Chain

November 2, 2009
Author(s)
David Hume, Chin-Wen Chou, Till P. Rosenband, David J. Wineland
… in trapped atomic ions. We consider a linear chain of N ion qubits that is prepared in a particular Fock state of … target ions trapped simultaneously with an 27Al+ ancillary ion. … Dicke state, entanglement, laser spectroscopy, ion trap, quantum information … Preparation of Dicke States in an Ion Chain …

Jovian Auroral Ion Precipitation: X-Ray Production from Oxygen and Sulfur Precipitation

December 9, 2019
Author(s)
Heman Gharibnejad, David Schultz, Thomas Cravens, Stephen Houston, W. R. Dunn, D. K. Haggerty, A. M. Rymer, B. H. Mauk, N. Ozak
… made to model X-ray emission from both bremsstrahlung and ion precipitation into Jupiter’s polar caps. Electron … observed by earth-orbit-based X-ray observatories. Heavy ion precipitation was able to reproduce strong X-ray fluxes, but the proposed incident ion energies were very high ($> $1 MeV/nucleon). Now with the …

Preparation and coherent manipulation of pure quantum states of a single molecular ion

May 11, 2017
Author(s)
Chin-Wen Chou, Christoph Kurz, David B. Hume, Philipp N. Plessow, David R. Leibrandt, Dietrich G. Leibfried
… broad range of molecular ions. We trap a single molecular ion in a linear Paul trap together with a single atomic ion. Using two laser beams far off-resonance, we drive Raman … that simultaneously change the state of the molecular ion and excite the shared motion of the two ions in the trap. …

The Role of Iron Redox State in the Genotoxicity of Ultrafine Superparamagnetic Iron Oxide Nanoparticles

September 21, 2011
Author(s)
Neenu Singh, Gareth J. Jenkins, Bryant C. Nelson, Bryce J. Marquis, Thierry G. Maffeis, Andy P. Brown, Paul M. Williams, Chris J. Wright, Shareen H. Doak
… Ultrafine superparamagnetic iron oxide nanoparticles (USPION) hold great potential for … a range of such characteristics in parallel. We show that iron redox state, a subtle though important physico-chemical … The Role of Iron Redox State in the Genotoxicity of Ultrafine …

Transport quantum logic gates for trapped ions

September 21, 2007
Author(s)
Dietrich G. Leibfried, Emanuel H. Knill, Christian Ospelkaus, David J. Wineland
… device. In one proposal for large- scale QIP, trapped ions are manipulated by precisely controlled light pulses and … performing single and multiple qubit operations on trapped ions. We show how a universal set of operations can be implemented by controlled transport of ions through stationary laser beams. At the same time, each …

Normal modes of trapped ions in the presence of anharmonic trap potentials

July 19, 2011
Author(s)
Jonathan Home, David Hanneke, John D. Jost, Dietrich Leibfried, David J. Wineland
… in the trapping potential for linear chains of trapped ions. We concentrate on two different effects, which become … a modification of the frequencies and mode vectors of the ions' normal modes of vibration for multi-ion crystals, … Normal modes of trapped ions in the presence of anharmonic trap potentials …

Proton and Ammonia Intercalation into Layered Iron Chalcogenides

June 25, 2018
Author(s)
Xiuquan Zhou, Brandon Wilfong, Sz-Chian Liou, Halyna Hodovanets, Craig Brown, Efrain E. Rodriguez
… Structurally related to the iron-based superconductors, two new intercalated iron chalcogenides (H 0.5 NH 3 )Fe 2 Ch 2 where Ch = S, Se … Proton and Ammonia Intercalation into Layered Iron Chalcogenides …

Fast and robust quantum computation with Wigner crystals of ions

April 15, 2011
Author(s)
J D. Baltrusch, A Negretti, T Calarco, Jacob Taylor
… quantum phase gate implemented with Wigner crystals of ions confined in Penning traps. We elaborate on a recent … by two of us, to engineer two-body interactions between ions in such crystals. We analyze for the first time the … Fast and robust quantum computation with Wigner crystals of ions …

Impact Energy Dependence of SF 5 + Ion Beam Damage of Poly(Methyl Methacrylate) Studied by Time-of-Flight Secondary Ion Mass Spectrometry

February 19, 2017
Author(s)
M S. Wagner, J Greg Gillen
… Recent advances in instrumentation for Secondary Ion Mass Spectrometry (SIMS) have focused on the application … polyatomic primary ions for enhancing molecular secondary ion signals of organic materials. A few studies have also … the unusual characteristic of maintaining their molecular ion signals after extended bombardment with polyatomic ion …

Synthesis, Structure, and Ion Conduction of Potassium Carbazolides for Potassium Ion Solid-State Electrolytes

September 20, 2024
Author(s)
Jiaquan Guo, Yang Yu, Khai Chen Tan, Qijun Pei, Zhao Li, Yuting Wang, Alexis Munyentwali, Hui Wu, Teng He, Ping Chen
… Potassium ion batteries gradually have aroused worldwide interest due … However, the research on the solid-state potassium-ion batteries is at its very early stage. The lack of … potassium solid-state electrolyte, potassium-ion battery, fast ion conduction, potassium carbazolide …

Pinhole X -ray camera photos of an ECR ion source plasma

November 1, 2011
Author(s)
Lawrence T. Hudson, Sandor Biri, E Takacs, R. Racz, J. Palinkas
… resolved images of an electron cyclotron resonance (ECR) ion source generated plasma. The method has good spatial … Pinhole X -ray camera photos of an ECR ion source plasma …

Highly charged ion (HCI) modified tunnel junctions

August 15, 2008
Author(s)
Joshua M. Pomeroy, Holger Grube
… have characterized some basic principles of this unique ion-surface interaction, but recent activity reported here is … tunnel junction, highly charged ions, electron beam ion trap (EBIT) … Highly charged ion (HCI) modified tunnel junctions …

Fabrication of Specimens for Atom Probe Tomography using a Combined Gallium and Neon Focused Ion Beam Milling Approach

August 16, 2023
Author(s)
Frances Allen, Paul Blanchard, David Pappas, Russell Lake, Deying Xia, John Notte, Ruopeng Zhang, Andrew Minor, Norman A. Sanford
… We demonstrate a new focused ion beam sample preparation method for atom probe tomography. … The key aspect of the new method is that we use a neon ion beam for the final tip shaping after conventional annulus milling using gallium ions. This dual-ion approach combines the benefits of the faster milling …

Collisional-Radiative Modeling for Highly-Charged Ions of Tungsten

April 23, 2013
Author(s)
Yuri Ralchenko
… in collisional-radiative modeling of highly-charged ions of tungsten that are relevant to fusion research. The status of spectroscopic data for W ions is briefly discussed as well. Strategies and … spectra, collisional-radiative modeling, highly-charged ions … Collisional-Radiative Modeling for Highly-Charged Ions of Tungsten …

Nanoscale Focused Ion Beam from Laser-cooled Lithium Atoms

October 26, 2011
Author(s)
Brenton J. Knuffman, Adam V. Steele, Jon Orloff, Jabez J. McClelland
… To advance the capabilities of focused ion beam (FIB) technology, we have created a low-energy FIB … in a magneto-optical trap (MOT). This magneto-optical trap ion source relies on both the low temperature of the … energy spread of the resultant beam to form a nanoscale ion probe at its focus. We present examples of microscopy …

The FeoC [4Fe4S] Cluster Is Redox-Active and Rapidly Oxygen-Sensitive

November 12, 2019
Author(s)
Aaron T. Smith, Richard O. Linkous, Nathan Max, Alexandrea E. Sestok, Veronika Szalai, Kelly N. Chacon
… The acquisition of iron is essential to establishing virulence among most … most bacteria utilize the widely-distributed ferrous iron (Fe2+) uptake (Feo) system to import metabolically-required iron. The Feo system is inadequately understood at the … iron sulfur cluster, epr spectroscopy, XAS, bacterial …

Highly Charged Ions in Rare Earth Permanent Magnet Penning Traps

July 13, 2012
Author(s)
Nicholas D. Guise, Samuel Brewer, Joseph Tan
… the isolation, manipulation, and study of highly charged ions. Highly charged ions are produced in the NIST electron-beam ion trap (EBIT), … NdFeB permanent magnets integrated into its electrodes. Ions of charge Qe, emerging from the EBIT with energy up to … Highly Charged Ions in Rare Earth Permanent Magnet Penning Traps …

Role of Particles in Counterflow Diffusion Flames Inhibited by Iron Pentacarbonyl

March 25, 2001
Author(s)
M D. Rumminger, Gregory T. Linteris
… in a methane-air counterflow diffusion flames inhibited by iron pentacarbonyl (Fe(CO)5) added to the fuel or the … flame inhibition, halon alternatives, nucleation, iron pentacarbonyl, metal oxides … of Particles in Counterflow Diffusion Flames Inhibited by Iron Pentacarbonyl …
Displaying 176 - 200 of 4257
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