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Displaying 1976 - 2000 of 3842

Comprehensive Inelastic Neutron Scattering Study of the Multiferroic Mn 1-x Co x WO 4

December 14, 2018
Author(s)
Jinchen Wang, R. S. Fishman, Yiming Qiu, J. A. Fernandez-Baca, Georg Ehlers, K.-C. Liang, Yaqi Wang, Bernd Lorenz, C. W. Chu, Feng Ye
… (J i up to 12th nearest-neighbors) and the single-ion anisotropy K induced by the spin-orbit interaction. While … the dominant effect of doping is to change the single-ion anisotropy from easy axis (K> 0) in the collinear AF1 …

A Schrodinger Cat" Superposition State of an Atom

January 1, 1996
Author(s)
C Monroe, D M. Meekhof, B E. King, David J. Wineland
… was generated at the single atom level. A trapped 9Be+ ion was laser-cooled to the zero-point energy and then … (electronic) and external (motional) states of the ion. The Schrödinger cat superposition was verified by …

Measurement of the Surface Density of States by Field Ionization

October 1, 1975
Author(s)
David R. Penn
… It is shown that recent measurements of field ion energy distributions from clean tungsten surfaces probe … We find j() = (2/kh)m| d3rm(r) z|2(-m), where j() is the ion current a , mand m are electronic metal eigenfunctions …

Molecular transport enhancement in purely metallic carbon nanotube porins

June 27, 2024
Author(s)
Yuhao Li, Sidi Zhao, Rahul Prasanna Misra, Chenxing Liang, Alice Judith Gillen, jobaer abdullah, Ted Laurence, Jeffrey Fagan, Narayana Aluru, Daniel Blankschtein, Aleksandr Noy
… nanotubes over the semiconducting nanotubes, whereas ion transport was largely insensitive to the nanotube … polarizability tensor of the carbon nanotubes to the ion-nanotube interactions and the water friction coefficient. …

Enhanced Proton Selectivity in Ionomer Nanocomposites Containing Hydrophobically Functionalized Silica Nanoparticles for Vanadium Redox Flow Batteries

January 4, 2021
Author(s)
Allison Domhoff, Tyler Martin, Liyanage M. Silva, Mansour Saberi, Stephen Creager, Eric Davis
… traditional PFSA ionomers suffer from high vanadium ion crossover, i.e., low ion selectivity, which reduces the efficiency and lifetime of … composite ionomers exhibit drastically reduced vanadium ion permeability and an almost two orders of magnitude …

Transport and Electromechanical Properties of Ca3TaGa3Si2O14 Piezoelectric Crystals at Extreme Temperatures

January 13, 2019
Author(s)
Yuriy Suhak, Ward L. Johnson, Andrei Sotnikov, Hagen Schmidt, Holger Fritze
… analysis of oxygen-18 diffusion profiles using secondary ion mass spectrometry (SIMS). Determined oxygen … self-diffusion coefficients enable calculation of oxygen ion contribution to the total conductivity, which is shown to … must be dominated by electron transport. Further, ion and electron conductivities are governed by different …

ToF-SIMS 3D Imaging of Native and Non-Native Species within HeLa Cells

November 26, 2013
Author(s)
Jeremy Brison, Michael A. Robinson, Danielle S. Benoit, Shinichiro Muramoto, Patrick S. Stayton, David G. Castner
… within single HeLa cells using time-of-flight secondary ion mass spectrometry (ToF-SIMS). The z-axis corrected 3D … Optimal 3D images were acquired using a Bi3+ liquid metal ion gun operating in the simultaneous high mass and spatial …

Validated Sheath Model for Radio-Frequency-Biased, High-Density Plasmas

October 16, 2008
Author(s)
Mark Sobolewski
… at frequencies (omega) comparable to (omega sub i), the ion plasma frequency at the edge of the sheath. The model treats ion dynamics using fluid equations, including all time … than that obtained by models which neglect time-dependent ion dynamics. The model explains why methods of extracting …

Alpha-Dot or Not: Comparison of Two Single Atom Optical Clocks

October 5, 2008
Author(s)
Till P. Rosenband, David Hume, Chin-Wen Chou, J.C. Koelemeij, A. Brusch, Sarah Bickman, Windell Oskay, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, William C. Swann, Wayne M. Itano, David J. Wineland, James C. Bergquist
Repeated measurements of the frequency ratio of Hg + and Al + single-atom optical clocks over the course of a year yield a constraint on the possible temporal variation of the fine-structure constant a. The time variation of the measured ratio corresponds

Rate Constants for Unimolecular Decomposition of SF 6 -

November 21, 2001
Author(s)
Yicheng Wang, R. Champion, I. V. Dyakov, B. Peko
Insulating gas mixtures containing SF 6 have been promoted to serve as replacements for pure SF 6 in order to reduce SF 6 atmospheric emission. It has been argued that some synergism may be achieved by choosing proper buffer gases in mixtures with SF 6

MALDI MS of Saturated Hydrocarbon Polymers: Polyethylene and Other Polyolefins

May 1, 2001
Author(s)
William E. Wallace, Charles M. Guttman, B M. Fanconi, Barry J. Bauer
Saturated hydrocarbon polymers, polyethylene and polypropylene, are, by production volume, the most widely used of all synthetic polymers. Their molecular mass and molecular mass distribution (MMD) are critical in determining performance properties. There

Charge-transfer rate constants for N+/2 (v=0-4) with Ar at thermal energies

July 1, 1996
Author(s)
S Kato, J A. de Gouw, C D. Lin, V M. Bierbaum, S R. Leone
Rate constants for the charge-transfer reaction N 2 +(V)+ Ar>N 2+Ar + are measured at thermal energies as a function of initial vibrational excitation by laser-induced fluorescence. The reaction is slow for v=0, whereas the rate constants for v=1-4 are

Photoluminescence from an Nd3+ doped AlGaAs semiconductor structure

May 16, 2004
Author(s)
Kirk Ullmann, Mark Su, Kevin L. Silverman, Joseph J. Berry, Todd E. Harvey, Richard Mirin
We report room temperature photoluminescence from a Nd3+ doped AlGaAs semiconductor. Oxidation of the AlGaAs greatly improves the luminescence efficiency of the Nd3+ ions.

Electron Energy Loss Spectroscopy of CeO 2 -x Nanoparticles

January 7, 2003
Author(s)
W Lijun, H J. Wiesmann, A R. Moodenbaugh, Daniel A. Fischer, Y Zhu, M Suenaga
ria has been widely studied due to its applications, such as a catalyst in vehicle emissions system and an electrolyte material in solid oxide fuel cells. Recently, it has been reported that CeO2-x nanoparticles exhibit lattice expansion and valence
Displaying 1976 - 2000 of 3842
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