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NIST Authors in Bold

Displaying 851 - 875 of 4258

Classical Trajectories and RRKM Modeling of Collisional Excitation and Dissociation of Benzylammonium and tert Butyl Benzylammonium Ions in a Quadrupole-Hexapole-Quadrupole Tandem Mass Spectrometer

March 1, 2010
Author(s)
Vadim D. Knyazev, Stephen Stein
… of the benzylammonium and the 4-tert butyl benzylammonium ions was studied experimentally in an electrospray ionization … were determined as functions of the kinetic energy of ions and the collider gas (argon) pressure. A theoretical … of the trajectories of the parent and the product ions flight through the hexapole collision cell, …

Scalable arrays of doped silicon RF Paul traps

October 26, 2009
Author(s)
Joseph W. Britton, Dietrich G. Leibfried, James A. Beall, Brad R. Blakestad, Janus H. Wesenberg, David J. Wineland
… and a multi-zone surface-electrode trap. From the measured ion motional heating rate we determine an electric field spectral density at the ion of approximately 1 × 10 -10 (V /m) 2 Hz −1 at ωz /2π {math equals} 1.125 MHz when the ion lies 40 υm above the electrode surface. One application …

3D Molecular Imaging SIMS

July 1, 2006
Author(s)
John G. Gillen, Albert J. Fahey, M Wagner, Christine M. Mahoney
… analyzed by dynamic SIMS using SF 5 + polyatomic primary ion bombardment. Each of these systems exhibited minimal … through the depth of the film. By combing secondary ion imaging with depth profiling, 3-dimensional molecular … sections are cut in the samples with the SF5+ primary ion beam to produce a laterally magnified cross section of …

Micro- and Nanoscale Surface Analysis of Late Iron Age Glass from Broborg, a Vitrified Swedish Hillfort

January 11, 2023
Author(s)
Bethany Matthews, James Neeway, Lorena Nava Farias, Jose Marcial, Bruce Arey, Jennifer Soltis, LiBor Kovarik, Zihua Zhu, Michael Schweiger, Nathan Canfield, Tamas Varga, Mark Bowden, Jamie Weaver, John McCloy, Rolf Sjoblom, Eva Hjarthner-Holdar, Mia Englund, Erik Ogenhall, Edward Vicenzi, Claire Corkhill, Clare Thorpe, Russell Hand, David Peeler, Carolyn Pearce, Albert Kruger
… and granitoid rocks, were obtained from Broborg, a Swedish Iron Age hillfort. Glasses were excavated from the top of the … Micro- and Nanoscale Surface Analysis of Late Iron Age Glass from Broborg, a Vitrified Swedish Hillfort …

Computational study of the dielectric properties of [La,Sc] 2 O 3 solid solutions

July 11, 2010
Author(s)
Hiroyoshi Momida, Eric J. Cockayne, Naoto Umezawa, Takahisa Ohno
… predicted at small Sc concentrations due to the rattling ion effect. Similar calculations for a model amorphous La2O3 … the Sc changes in a way that compensates for the rattling ion effect. … gate dielectrics, high-k dielectrics, rattling ion effect …

Collisional Electron-Detachment and Ion Conversion Processes in SF6

November 1, 1990
Author(s)
James K. Olthoff, Richard J. Van Brunt, Yicheng Wang, L. D. Doverspike, R. Champion
… 6th Intl. Swarm Seminar entitled Nonequilibrium Effects in Ion and Electron Transport, … Collisional Electron-Detachment and Ion Conversion Processes in SF6 …

Amorphous Calcium Phosphate/Urethane Methacrylate Resin Composites. I. Physicochemical Characterization

May 7, 2007
Author(s)
William Regnault, Tonya Icenogle, Joseph M. Antonucci, Drago Skrtic
… were polymerized and evaluated for mechanical strength and ion release profiles in different aqueous media. Strength of … and the pH of the liquid environment strongly affected the ion release kinetics. In saline, the UDMA/PEG-U composite … a sustained release for at least 350 h. The initially high ion release of the PEG-U composites decreased after 72 h, …

Fabrication of Lithium Indolide and Derivates for Ion Conduction

September 14, 2022
Author(s)
Jintao Wang, Yang Yu, Anan Wu, Khai Chen Tan, Hui Wu, Teng He, Ping Chen
… Alkali-ion batteries have been widely used nowadays. The development … derivates show pronounced ionic conductivities, e.g., the ion conductivity of sodium carbazolide ditetrahydrofuran … Fabrication of Lithium Indolide and Derivates for Ion Conduction …

A single-atom optical clock with high accuracy

July 14, 2006
Author(s)
Windell Oskay, Scott A. Diddams, Elizabeth A. Donley, Tara M. Fortier, Thomas P. Heavner, Leo W. Hollberg, Wayne M. Itano, Steven R. Jefferts, M J. Jensen, Kyoungsik Kim, F Levi, Thomas E. Parker, James C. Bergquist
… transition in a single, laser-cooled, trapped mercury ion. In this comparison, the fractional systematic frequency … conclusively that frequency control in the mercury-ion system is possible at a level superior to that of the … cesium fountain, femtosecond laser frequency comb, mercury-ion frequency standard, optical frequency standard, …

Frequency Measurements of Al+ and Hg+ Optical Standards

June 8, 2009
Author(s)
Wayne M. Itano, James C. Bergquist, Till P. Rosenband, David J. Wineland, David Hume, Chin-wen Chou, Steven R. Jefferts, Thomas P. Heavner, Tom Parker, Scott Diddams, Tara Fortier
… aluminum ion, mercury ion, optical frequency standards, time variation of fundamental constants, trapped ion frequency standards …

Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger Cat

January 1, 1999
Author(s)
David J. Wineland, C Monroe, Wayne M. Itano, D Kielpinski, B E. King, C J. Myatt
… at NIST to implement quantum computation using trapped ions, based on a scheme proposed by J.I. Cirac and P. Zoller … Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger Cat …

Molecular Mass Determination of Saturated Hydrocarbons: Reactivity of eta- 5 -Cyclopentadienylcobalt Ion (CpCo. +) and Linear Alkanes up to C-30

January 1, 2003
Author(s)
H M. Byrd, Kathleen M. Flynn, D P. Ridge
… the feasibility of the h 5 -cyclopentadienylcobalt ion (CpCo +) as a suitable cationization reagent for saturated hydrocarbons analysis by mass spectrometry. Ion/molecule reactions of CpCo + and three medium … n-alkanes were examined using Fourier-transform ion cyclotron resonance mass spectrometry. Second-order rate …

Ambient-Temperature Hydrogen Storage via Vanadium(II)-Dihydrogen Complexation in a Metal-Organic Framework

April 28, 2021
Author(s)
David Jaramillo, Henry Jiang, Hayden Evans, Romit Chakraborty, Hiroyasu Furukawa, Craig Brown, Martin Head-Gordon, Jeffrey Long
… which features exposed vanadium(II) sites capable of backbonding with weak π acids. … the same operating conditions. The Kubas-type vanadium(II)–dihydrogen complexation is characterized by a combination … Ambient-Temperature Hydrogen Storage via Vanadium(II)-Dihydrogen Complexation in a Metal-Organic Framework …
Displaying 851 - 875 of 4258
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