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Displaying 551 - 575 of 2904

Adsorption From Solutions on Synthetic Hydroxyapatite: Nonaqueous Versus Aqueous Solvents

July 1, 1999
Author(s)
D N. Misra
… of solutes from aqueous solutions generally involves ion-exchange with the apatite surface, and may be affected by … mass, and their ability to self-associate. The hydrogen ion concentration plays a decisive role in each one of the … of solutes from aqueous solutions generally involves ion-exchange with the apatite surface, and may be affected by …

Quantitative Depth Profiling of an Alternating Pt/Co Multilayer and a Pt-Co Alloy Multilayer by SIMS Using a Buckministerfullerene (C 60 )

January 1, 2007
Author(s)
K J. Kim, David S. Simons, J Greg Gillen
… A Buckminsterfullerene ion beam has been applied to the depth profiling of an … Quantitative depth profiling was performed by secondary ion mass spectrometry (SIMS) with C60 ions using Pt-Co alloy … due to the nonlinear relationship between the Co and Pt ion intensities and their compositions. …

Quadruply-ionized barium as a candidate for a high-accuracy optical clock

October 23, 2020
Author(s)
Kyle Beloy, Vladimir A. Dzuba, Samuel Brewer
… calculations to determine relevant properties of this ion. The lifetime of the excited clock state is found to be … accommodating low statistical uncertainty with a single ion for practical averaging times. The differential static … atomic clock, highly-charged ion, ion clock, optical clock, optical frequency standard …

Depth Profiling of 4-Acetamindophenol-Doped Poly(lactic acid) Films Using Cluster Secondary Ion Mass Spectrometry

June 1, 2004
Author(s)
Christine M. Mahoney, S V. Roberson, John G. Gillen
… The feasibility of cluster Secondary Ion Mass Spectrometry (SIMS) for depth profiling of drug … biodegradable polymer films under dynamic SF 5 + primary ion bombardment was investigated including several films … polymer films showed very little degradation in secondary ion signal as a function of increasing primary ion dose, and …

Resource-efficient dissipative entanglement of two trapped-ion qubits

August 6, 2021
Author(s)
Daniel Cole, Stephen Erickson, Giorgio Zarantonello, Panyu Hou, Jenny Wu, Karl Horn, Daniel Slichter, Florentin Reiter, Christiane Koch, Dietrich Leibfried
… method for generating an entangled state of two trapped-ion qubits. Our implementation produces its target state … Resource-efficient dissipative entanglement of two trapped-ion qubits …

Scalable Entanglement of Trapped Ions

January 1, 2000
Author(s)
C Monroe, Q A. Turchette, D Kielpinski, B E. King, V Meyer, Wayne M. Itano, David J. Wineland, C J. Myatt, M A. Rowe, Christopher Langer, C A. Sackett
… state so far in a collection of four trapped atomic ions. Notably, we employ a technique that is readily scalable … Scalable Entanglement of Trapped Ions …

Randomized Benchmarking of Multiqubit Gates

June 29, 2012
Author(s)
John P. Gaebler, Adam M. Meier, Ting Rei Tan, Ryan S. Bowler, Yiheng Lin, David Hanneke, John D. Jost, Jonathan Home, Emanuel H. Knill, Dietrich G. Leibfried, David J. Wineland
… We implemented the benchmarking procedure with trapped-ion two-qubit phase gates and one-qubit gates and found an …

Isotopic Metrology of Carbon Dioxide. I. Interlaboratory Comparison and Empirical Modeling of Inlet Equilibration Time, Inlet Pressure, and Ion Source Conductance

June 1, 2003
Author(s)
R M. Verkouteren, C E. Allison, S A. Studley, K J. Leckrone
… were designed to explore the effects of sample size, ion source conductance, and inlet changeover equilibration … carbon dioxide, gas isotope ratio mass spectrometer, GIRMS, ion source materials, isotopic measurements … Modeling of Inlet Equilibration Time, Inlet Pressure, and Ion Source Conductance …

Far-from-equilibrium noise heating and laser cooling dynamics in radio-frequency Paul traps

April 23, 2019
Author(s)
A Maitra, Dietrich Leibfried, D. Ullmo, H. Landa
… to a detailed study of the stochastic dynamics of an ion in the different regimes of motion within an anharmonic … becoming diffusive (i.e. it is equally likely to cool the ion as it is to heat it), and also turning into an effective … heating. Such a mechanism implies that a high-energy ion would be easily lost from the trap despite being laser …

Electrodeposition of Al-Zr Alloys From the Lewis Acidic Aluminum Chloride-1-Ethyl-3-methylimidazolium Chloride Melt

July 1, 2004
Author(s)
T Tsuda, C L. Hussey, Gery R. Stafford, O Kongstein
… The electrochemistry of Zr(IV) and Zr(II) and the electrodeposition of Al-Zr alloys were … molten salt at 353 K. The electrochemical reduction of Zr(IV) to Zr(II) is complicated by the precipitation of … solutions of Zr(II) can be prepared by reducing Zr(IV) with Al wire. Al-Zr alloys can be electrodeposited from …

Ion-beam radiation damage to DNA by investigation of free radical formation and base damage

March 1, 2020
Author(s)
Melis Kant, Pawel Jaruga, Erdem Coskun, Samuel Ward, Alexander Stark, David Becker, Amitav Adhikary, Michael Sevilla, Miral M. Dizdar
… processes and DNA base products involved in Ne-22 ion- beam (ca. 1.4 GeV) radiation damage to hydrated (12 … x 1 mm) samples were stacked in a sample packet and then ion-beam irradiated at 77 K. Free radicals trapped in ion- beam irradiated DNA at 77 K were elucidated using ESR …

Spectroscopy Using Quantum Logic

July 29, 2005
Author(s)
Piet Schmidt, Till P. Rosenband, C. Langer, Wayne M. Itano, James C. Bergquist, David J. Wineland
… with trapped atomic ions, an auxillary "logic" ion provides sympathetic laser cooling, state initialization, … and detection for simultaneously trapped "spectroscopy" ion. Detection is achieved by applying a mapping operation on each ion, which results in a coherent transfer of the spectroscopy …

Unexpected Peaks in Tandem Mass Spectra due to Reaction of Product Ions with Water in Mass Spectrometer Collision Cells

December 15, 2014
Author(s)
Pedatsur Neta, Mahnaz Farahani, Yamil Simon, Yuxue Liang, Xiaoyu Yang, Stephen E. Stein
… While determining the fragmentation pathways of positive ions of drugs, pesticides, metabolites, and other compounds, … mass spectrometry, we noticed that certain product ions react with water in the collision cell. This reaction is … of species that cannot be formed from the precursor ions by known fragmentation pathways. As a result, tandem …

Field-induced dehydration and optimal ionic escape paths for C2N membranes

June 11, 2021
Author(s)
Miroslav Barabash, William Gibby, Dmitry Luchinsky, Binquan Luan, Alexander Smolyanitsky, Peter McClintock
… Most analytic theories describing electrostatically driven ion transport through water-filled nanopores assume that the … the specific field-induced phenomena arising during ion transport. Here we consider an atomistic model of electrostatically driven ion permeation through subnanoporous C2N membranes. We …

Quantum information processing and quantum control with trapped atomic ions

December 14, 2009
Author(s)
David J. Wineland
… The role of trapped atomic ions in the field of quantum information processing is … discuss some of the historical developments that enabled ions to enter the field and then summarize the basic … processing and quantum control with trapped atomic ions …

Isotopic Ratio Measurements by Time-of-Flight Secondary Ion Mass Spectrometry

July 1, 2001
Author(s)
Albert J. Fahey, S R. Messenger
… Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) is often considered … synonymous with SIMS in the static limit where the ion fluence on the sample surface is so low that damage is … been ruled out. However, the high spatial resolution Ga+ ion beams typically used in ToF-SIMS make it a potentially …
Displaying 551 - 575 of 2904
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