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Search Publications

NIST Authors in Bold

Displaying 501 - 525 of 4633

Effective Attenuation Length Dependence on Photoelectron Kinetic Energy for Gold from 1 keV to 10 keV: Role of Island Growth in Overlayer Experiments

April 3, 2019
Author(s)
Cedric J. Powell, Aleksander Jablonski
… measurements of effective attenuation lengths (EALs) of gold for electron energies between 1 keV and 15 keV. They deposited thin films of gold on a copper substrate and measured the intensities of … effective attenuation length, film growth, gold, island growth, X-ray photoelectron spectroscopy …

Direct-write Lithiation of Silicon Using a Focused Ion Beam of Li+

July 8, 2019
Author(s)
William R. McGehee, Evgheni Strelcov, Vladimir P. Oleshko, Christopher L. Soles, Nikolai B. Zhitenev, Jabez J. McClelland
… processes that govern the performance of lithium ion batteries involve numerous parallel reactions and … of these systems. As a new way to study the behavior of ion transport and reaction in these applications, we report the use of a focused ion beam of Li+ to locally insert controlled quantities of …

Single Molecule Measurements of Trapped Circular DNA During Electrophoresis in Agarose Gels

November 1, 2006
Author(s)
Kenneth D. Cole, Adolfas K. Gaigalas, B. Akerman
… of 52.5 kilo basepairs (kbp), 115 kbp, and 220 kbp were trapped by the electric field (6 V/cm) and found to be … of 0.0025, 0.01, and 0.02). The relaxation kinetics of the trapped circles was measured in the gels. The relaxation of … Single Molecule Measurements of Trapped Circular DNA During Electrophoresis in Agarose Gels …

EUV spectra from N-shell ions of Gd, Dy and W

September 23, 2013
Author(s)
Deirdre Kilbane, John D. Gillaspy, Yuri Ralchenko, Joseph Reader, G. O'Sullivan
… radiation from gadolinium, dysprosium and tungsten ions with an open n=4 shell were performed at the National Institute of Standards and Technology. The ions were produced and confined in an electron beam ion trap … EUV spectra from N-shell ions of Gd, Dy and W …

Surface Analysis Studies of Yield Enhancements in Secondary Ion Mass Spectrometry by Polyatomic Projectiles

May 1, 2001
Author(s)
E Fuoco, J Greg Gillen, M Wijesundara, William E. Wallace, L Hanley
… In this paper examine the mechanism of secondary ion yield enhancements previously observed for polyatomic … profilometry. Thus, the > 10x enhancement in secondary ion yield in secondary ion mass spectrometry observed for polyatomic ion projectiles … cluster bombardment, polyatomic ion bombardment, secondary ion mass spectrometry, sputter …

International Comparison on Thermal Conductivity Measurements of Insulating Materials by Guarded Hot Plate

September 2, 2009
Author(s)
Bruno Hay, Leonel Lira Cortes, Benoit Doucey, Jean Remy Filtz, Nikolay Sokolov, Clark Stacey, Robert R. Zarr, Jintao Zhang
… National Metrology Institutes (NMIs) using Guarded Hot Plate apparatus according to the International Standard ISO … BIPM, expanded polystyrene, guarded hot plate, inter-laboratory comparison, mineral wool, national … Measurements of Insulating Materials by Guarded Hot Plate …

Solute Trapping and Solute Drag in a Phase-Field Model of Rapid Solidification

September 1, 1998
Author(s)
N A. Ahmad, A A. Wheeler, William J. Boettinger, Geoffrey B. McFadden
… equilibrium thermodynamics. This process, known as solute trapping, leads to a progressive reduction in the … Phys. Rev. E (1993) 1893] in which we demonstrated solute trapping. Here we show that solute trapping is also possible in a simpler diffuse interface …

Reversible Room-Temperature Fluoride-Ion Insertion in a Tunnel-Structured Transition Metal Oxide Host

July 6, 2020
Author(s)
Cherno Jaye, Wasif Zaheer, Justin L. Andrews, Forrest P. Hyler, Conan Weiland, David A. Shapiro, Jinghua Guo, Jesus M. Velazquez, Sarbajit Banerjee, Abhishek Parija, Daniel Fischer
… An energy storage paradigm orthogonal to conventional Li-ion battery chemistries can be conceptualized by employing anions as the primary charge carriers. F-ion conversion chemistries show promise but have limited … must further operate at elevated temperatures to achieve F-ion diffusion. In contrast, the exploration of intercalation …

Noninvasive Monitoring of Ion Energy Drift in an Inductively Coupled Plasma Reactor

February 1, 2005
Author(s)
Mark A. Sobolewski
… A non-invasive method for monitoring ion current and ion kinetic energy has been used to monitor drift in an … plasmareactor. The technique detects a slow decrease in ion current over time caused by the deposition of a … electrical measurements, inductively coupled plasma, ion current, ion energy, plasma, process monitoring, …

Measured cross sections and ion energies for a CHF 3 discharge.

August 1, 2002
Author(s)
B. Peko, R. Champion, MVVS. Rao, James K. Olthoff
… silicon substrate. Such surface etching is governed by the ion and molecule fluxes near the surface, the concentrations … the plasma. In order to assist in the interpretation of ion flux measurements and to provide fundamental data … we report the first total cross sections for significant ion-molecular reactions occurring in CHF 3 discharges. The …

Recent Advances in Focused Ion Beam Technology and Applications

April 11, 2014
Author(s)
Nabil Bassim, Keana Scott, Lucille A. Giannuzzi
… Focused ion beam (FIB) microscopes are extremely versatile and … systems. The advent of novel instrumentation such as new ion sources which encompass more and more of the periodic … detector configurations for 3D structural, chemical and ion contrast characterization, and robust and versatile …

Frequency Biases in a Cold-Atom Coherent Population Trapping Clock

May 22, 2014
Author(s)
Elizabeth A. Donley, Eric M. Blanshan, Francois-Xavier R. Esnault, John E. Kitching
… A compact cold-atom clock based on coherent population trapping (CPT) has been developed. The clock typically … Atomic Clocks, Coherent Population Trapping, Laser Cooling … Frequency Biases in a Cold-Atom Coherent Population Trapping Clock …

NIST Gold Nanoparticle Reference Materials Do Not Induce Oxidative DNA Damage

February 1, 2013
Author(s)
Bryant C. Nelson, Donald H. Atha, John T. Elliott, Bryce J. Marquis, Elijah J. Petersen, Danielle Cleveland, Stephanie S. Watson, I-Hsiang Tseng, Andrew Dillon, Melissa Theodore, Joany Jackman
… Institute of Standards and Technology has developed three gold nanoparticle (AuNP) reference materials (10 nm, 30 nm, … DNA damage, genotoxicity, gold nanoparticles, mass spectrometry, modified nucleosides, … NIST Gold Nanoparticle Reference Materials Do Not Induce Oxidative …

Impact of Ni-like metastable states and hyperfine quenching on charge state distribution in an EBIT

June 30, 2025
Author(s)
Chowdhury Abrar Faiyaz, Endre Takacs, Timothy Burke, FNU Dipti, Galen O'Neil, Adam Hosier, Hunter Staiger, Joseph Tan, Yuri Ralchenko
… and spectral features of ions in electron beam ion trap (EBIT) devices. Ladder ionization with intermediate … Nd ions, we show that these processes significantly alter ion populations and spectra, emphasizing the importance of … Plasma diagnostics - charged-particle spectroscopy, Ion sources (positive ions, negative ions, electron cyclotron …

Optimizing Instrument Operation and Data Processing for Single Particle Inductively Coupled Plasma Mass Spectrometry Measurement of Gold Nanoparticles

May 16, 2013
Author(s)
Jingyu Liu, Karen E. Murphy, Robert I. MacCuspie, Michael R. Winchester
… the performance of single particle-ICP-MS (spICP-MS) for gold nanoparticle (AuNPs) characterization. Instrument … Single particle ICP-MS, nanomaterial characterization, gold nanoparticles … Coupled Plasma Mass Spectrometry Measurement of Gold Nanoparticles …

Wideband infrared trap detector based upon doped silicon photocurrent devices

April 9, 2018
Author(s)
Solomon I. Woods, James E. Proctor, Timothy M. Jung, Adriaan C. Carter, Dana R. Defibaugh, Jorge Neira
… (Si:As) blocked impurity band (BIB) photodetectors. These trap detectors are composed of two detectors in a wedge … spectral flatness, and spatial uniformity make these trap detectors an excellent reference detector for … BIB detector, trap detector, infrared detector, blocked impurity band …

Generation of coherent population trapping resonances with nearly 100% transmission contrast

May 29, 2007
Author(s)
V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
… setup for observing very high contrast coherent population trapping resonances in rubidium-87. The high contrast is … atomic clocks, coherent population trapping, four-wave-mixing, magnetometers … Generation of coherent population trapping resonances with nearly 100% transmission contrast …
Displaying 501 - 525 of 4633
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