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Search Publications

NIST Authors in Bold

Displaying 951 - 975 of 3841

Tunnel junction sensors for HCI-surface measurements at low kinetic energies

January 25, 2013
Author(s)
Joshua M. Pomeroy, Russell E. Lake
… created by particle surface interactions. Highly charged ion (HCI) produced nanofeatures have been the focus of our … due a direct vacuum connection to the NIST electron beam ion trap (EBIT). Using these sensors, we have been able to … Highly charged ions, electron beam ion trap, tunnel junction sensors, stopping power …

Ultrashallow Depth Profiling with Time-of-flight Secondary Ion Mass Spectrometry

January 1, 1994
Author(s)
J. Bennett, John A. Dagata
… Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is an efficient, sensitive … of TOF-SIMS ultrashallow depth profiling is demonstrated ion GaAs substrates that were passivated with P2S5 solutions … Ultrashallow Depth Profiling with Time-of-flight Secondary Ion Mass Spectrometry …

Spin-on-Glass Thin Films Prepared From a Novel Polysilsesquioxane by Thermal and Ultraviolet-Irradiation Methods

January 1, 1999
Author(s)
Q Pan, G B. Gonzalez, R J. Composto, William E. Wallace, B Arkles, L K. Figge, D H. Berry
… to 55% of its original thickness within 60 min. A range of ion scattering techniques are used to completely characterize … increasing temperature from 225 C to 450 C, the carbon, hydrogen and chlorine atomic concentrations monotonically … dielectric, ion scattering, ormosil, photolysis, polysilsesquioxane, …

Reference Viscosities of H 2 , CH 4 , Ar and Xe at Low Densities

August 1, 2007
Author(s)
E May, Robert F. Berg, Michael R. Moldover
… We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These … argon, hydrogen, methane, thermal conductivity, viscosity, xenon …

Toward an Improved Color Rendering Metric

July 13, 2005
Author(s)
Wendy L. Davis, Yoshihiro Ohno
Several aspects of the Color Rendering Index (CRI) are flawed, limiting its usefulness in assessing the color rendering capabilities of LEDs for general illumination. At NIST, we are developing recommendations to modify the CRI that would overcome these

An Unconventional Tradespace of Focused-Ion-Beam Machining

June 20, 2022
Author(s)
Andrew Madison, John S. Villarrubia, Kuo-Tang Liao, Joshua Schumacher, Kerry Siebein, Robert Ilic, James Alexander Liddle, Samuel M. Stavis
… focused-ion-beam machining, resolution, throughput, chromia, silica … An Unconventional Tradespace of Focused-Ion-Beam Machining …

Effects of an Oscillating Electric Field on and Dipole Moment Measurement of a Single Molecular Ion

May 31, 2023
Author(s)
Alejandra Collopy, Julian Schmidt, Dietrich Leibfried, David Leibrandt, Chin-wen Chou
… (rf) electric field experienced by a molecular ion in an rf Paul trap, a leading systematic in the … uncertainty of the field-free rotational transition. The ion is deliberately displaced to sample different known rf … comb which probes rotational transitions in the molecular ion. With improved coherence of the comb laser, a fractional …

Coherently displaced oscillator quantum states of a single trapped atom

June 11, 2019
Author(s)
Katherine C. McCormick, Jonas Keller, David J. Wineland, Andrew C. Wilson, Dietrich Leibfried
… harmonic oscillator number states of a harmonically bound ion can be coupled to two internal states of the ion by a laser-induced motional sideband interaction. The … detuning of the displacement drive with respect to the ion's motional frequency. We precisely characterize the …

Uranium Ion Yields from Monodisperse Uranium Oxide Particles

February 24, 2016
Author(s)
Nicholas E. Sharp, John D. Fassett, David S. Simons
… Secondary ion mass spectrometry (SIMS) plays an important role in … isotopic measurements. The influence of primary ion beam species and polarity on U+ sample utilization … [2]. However, the effect of sample substrate on uranium ion production efficiency and sputtering profile has not been …

The NIST EBIT; A Progress Report

January 1, 1993
Author(s)
John D. Gillaspy, J R. Roberts, Craig M. Brown, Uri Feldman
… (1993 publication) The invention of the Electron Beam Ion Trap (EBIT) at Livermore has marked the emergence of a … atoms, EBIT, electron beam ion trap, highly charged atoms …

High-Resolution Structural Study of Zinc Ion Incorporation at the Calcite Cleavage Surface

October 12, 2021
Author(s)
L Cheng, N Sturchio, Joseph Woicik, K Kemner, P Lyman, Michael Bedzyk
… used to determine the atomic-scale structure of the Zn 2+ ion incorporated at the CaCO 3 (1014) surface by adsorption … Zn-O nearest-neighbor distance. Relaxation of the Zn 2+ ion in the out-of-plane direction is indicated by the … High-Resolution Structural Study of Zinc Ion Incorporation at the Calcite Cleavage Surface …

Co-adsorption of cations causes the apparent pH dependence of hydrogen adsorption on a stepped platinum single-crystal electrode

October 23, 2017
Author(s)
Xiaoting Chen, Ian McCrum, Kathleen Schwarz, Michael Janik, Marc Koper
… of the fundamental interactions of the key intermediates (hydrogen and hydroxyl) at electrified metal-aqueous … co-adsorption causes the apparent pH dependence of "hydrogen" adsorption in the step sites of platinum electrodes. … of cations causes the apparent pH dependence of hydrogen adsorption on a stepped platinum single-crystal …

Exfoliated transition metal dichalcogenide (TMD) nanosheets for supercapacitor and sodium ion battery applications

August 14, 2019
Author(s)
Jonathan Turley, Santanu Mukherjee, Elisabeth Mansfield, Jason Holm, Lamuel David, Gurpreet Singh
… regarding the safety, flammability and hazards posed by Li-ion systems has led to the research of alternative rechargeable metal-ion electrochemical storage technologies. Among the most notable of these are the Na-ion supercapacitors and batteries, motivated in part because …

Coordinated Neutron and X-ray Computed Tomography of Meteorites: Detection and Distribution of Hydrogen-Bearing Materials

August 29, 2022
Author(s)
Allan Treiman, Jacob LaManna, Isabella DeClue, Daniel S. Hussey, Lawrence Anovitz
… The presence and distribution of hydrogen-bearing materials in meteorites are important … NXCT, can reveal the presence and distributions of hydrogen-bearing materials in meteorites, and thus help … Tomography of Meteorites: Detection and Distribution of Hydrogen-Bearing Materials …

Measurement of the 2P1/2-2P3/2 fine structure splitting in fluorine-like Kr, W, Re, Os and Ir

September 2, 2020
Author(s)
Galen O'Neil, Samuel C. Sanders, Paul Szypryt, Dipti Goyal, Amy Gall, Yang Yang, Samuel M. Brewer, William Doriese, Joseph Fowler, Daniel Swetz, Joseph Tan, Joel Ullom, Andrey V. Volotka, Endre Takacs, Yuri Ralchenko
… energy in F-like ions using the NIST electron beam ion trap and extreme-ultraviolet and x-ray spectrometers. … electrodynamics, fine structure splitting, electron beam ion trap, x-ray spectrometers …
Displaying 951 - 975 of 3841
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