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Displaying 751 - 775 of 4258

Recovery of background structures in nanoscale Helium Ion Microscope imaging, and the use of progressive fractional diffusion smoothing.

December 31, 2014
Author(s)
Andras Vladar
… two step enhancement technique applicable to noisy Helium Ion Microscope images in which background structures are not … fractional diffusion smoothing, nanoscale helium ion microscopy, noise reduction, HIM, SEM. … Recovery of background structures in nanoscale Helium Ion Microscope imaging, and the use of progressive fractional …

Dehydration vs. Deamination of N-Terminal Glutamine in Collision-Induced Dissociation of Protonated Peptide Ions

August 11, 2006
Author(s)
Pedatsur Neta, Quan-Long Pu, Lisa E. Kilpatrick, Xiaoyu Yang, Stephen E. Stein
… mass spectrometry in singly- and doubly-protonated peptide ions undergoing collision-induced dissociation in a triple … QLLLPLLLK and QLLLPLLLR show that the singly protonated ions undergo loss of ammonia and to a smaller extent loss of water, whereas the doubly protonated ions undergo predominantly loss of water. The fast …

Secondary Ion Yield Matrix Effects in SIMS Depth Profiles of Si/Ge Multilayers

April 1, 1989
Author(s)
John G. Gillen, J M. Phelps, Randall W. Nelson, Peter Williams, Steven M. Hues
… thicknesses of 4-33 nm, have been analyzed by secondary ion mass spectrometry (SIMS) using Ar+, O2+ and Cs+ primary ion beams. Bombardment with both Ar+ and O2+ produced positive secondary ion depth profiles in which pronounced distortions were … Secondary Ion Yield Matrix Effects in SIMS Depth Profiles of Si/Ge …

Phase-coherent sensing of the center-of-mass motion of trapped-ion crystals

November 9, 2020
Author(s)
Matthew Affolter, Kevin Gilmore, Elena Jordan, John Bollinger
… Measurements of the center-of-mass motion of a trapped-ion crystal that are phase- coherent with an external force … the trap motional frequency on a two-dimensional trapped ion crystal of approximately 100 ions, and determine the … of weak force and electric field detection below 10−3yN/ion and 1 nV/m, respectively. …

Spectroscopy of a single Al + ion via coupling to Be +

July 25, 2005
Author(s)
Till P. Rosenband, Piet Schmidt, Jeroen Koelemeij, Wayne M. Itano, Yohei Kobayashi, Tara M. Fortier, Scott A. Diddams, James C. Bergquist, David J. Wineland
… precision spectroscopy on 27 Al + with the aid of a 9 Be + ion. Using sympathetic cooling and quantum state transfer, we … Spectroscopy of a single Al + ion via coupling to Be + …

Effects of Resin Composition on the Remineralizing Ability of Amorphous Calcium Phosphate-Based Polymeric Composites

January 1, 2000
Author(s)
Joseph M. Antonucci, Drago Skrtic, E D. Eanes
… Bis-GMA/TEGDMA composites gave extremely low levels of ion release, the UDMA composites gave moderate sustainable release of ions. High, sustainable levels of ion release were obtained from the HEMA-containing … acid matrix composite based on PMGDMA initially gave high ion release, but this was not sustainable because of …

Minimization of ion micromotion in a Paul trap

January 1, 1998
Author(s)
D J. Berkeland, J D. Miller, James C. Bergquist, Wayne M. Itano, David J. Wineland
… micromotion. The first relies on the change of the average ion position as the trap potentials are changed. The second … Minimization of ion micromotion in a Paul trap …

Degradation of Poly (Acrylates Under SF 5 + Primary Ion Bombardment Studied Using Time of Flight Secondary Ion Mass Spectrometry 1. Effect of Main Chain and Pendant Methyl Groups

October 16, 2008
Author(s)
M S. Wagner
… to the depth profiling of organic materials by secondary ion mass spectrometry (SIMS). Polyatomic primary ions offer … of the polymer on its degradation under polyatomic primary ion bombardment has not yet been systematically studied. In this study, positive and negative ion time-of-flight SIMS (ToF-SIMS) was used to measure the …

Experimental demonstration of robust, high-fidelity geometric two ion-qubit phase gate

January 1, 2003
Author(s)
Dietrich G. Leibfried, B. L. DeMarco, V Meyer, D Lucas, Murray D. Barrett, Joseph W. Britton, Wayne M. Itano, Branislav M. Jelenkovic, Christopher Langer, Till P. Rosenband, David J. Wineland
… a universal geometric pi-phase gate between two beryllium ion-qubits, based on coherent displacements induced by an … force can be considered constant over the extent of each ion's wave packet. By combining the gate with single-qubit … experiment demonstrating a universal gate between two ion-qubits. The particular properties of the gate make it …

CCT Key Comparison No 1 (CCT-K1): Realisations of the ITS-90, 0.65 K to 24.5561 K, Using Rhodium-Iron Resistance Thermometers

June 1, 2004
Author(s)
R L. Rusby, Christopher W. Meyer, Weston L. Tew, D I. Head, K D. Hill, O Tamura, P A. de Groot, B Fellmuth, A Storm, A Peruzzi, J Engert, D N. Astrov, Y Dedikov, G A. Kytin
… 24.5561 K). The comparison was carried out using rhodium-iron resistance thermometers from the seven participating … of the ITS-90, 0.65 K to 24.5561 K, Using Rhodium-Iron Resistance Thermometers …

Proceedings of Static Analysis Summit II

April 1, 2008
Author(s)
Paul E. Black, Elizabeth N. Fong
… Static Analysis Summit II was held 8 and 9 November 2007.  The workshop had a … Proceedings of Static Analysis Summit II …

Coexistence of Superconductivity and Antiferromagnetism in (Li 0.8 Fe 0.2 ) OHFeSe

March 1, 2015
Author(s)
X. F. Lu, N. Z. Wang, Hui Wu, Y. P. Wu, D. Zhao, X. Z. Zeng, X. G. Luo, T. Wu, W. Bao, G. H. Zhang, F. Q. Huang, Qingzhen Huang, X. H. Chen
… superconductors show some unique behaviors relative to iron-pnictide superconductors, which are very helpful to … understand the mechanism of superconductivity in high-T c iron-based superconductors. The low-energy electronic … ingredient for the unconventional superconductivity in iron-based superconductors. The superconducting transition …

Stoichiometric Preference in Copper-Promoted Oxidative DNA Damage by Ochratoxin A

October 1, 2003
Author(s)
R A. Manderville, W M. Calcutt, J Dai, G Park, I G. Gillman, R E. Noftle, A K. Mohammed, M. Dizdaroglu, H Rodriguez, S A. Akman
… and gas chromatography/mass spectrometry with selected-ion monitoring (GC/MS-SIM). OTA is shown to promote oxidative … with optimal cleavage efficiency occurring under excess Cu(II) conditions. As the concentration of OTA was increased and present in excess of Cu(II) the cleavage was less effective. Parallel findings were …

Degradation of Poly(Acrylates) Under SF 5 ^+^ Primary Ion Bombardment Studied Using Time of Flight Secondary Ion Mass Spectrometry3. Poly (Hydroxyethyl Methacrylate) With Chemical Derivazation

October 16, 2008
Author(s)
M S. Wagner
… Molecular depth profiling of polymers by secondary ion mass spectrometry (SIMS) has focused on the use of … chemistry on polymer degradation under polyatomic primary ion bombardment. In this study, time-of-flight SIMS … group chemistry on their degradation. The sputter rate and ion-induced damage accumulation rate of PHEMA were similar to …

Quantum Computing with Very Noisy Devices

February 13, 2007
Author(s)
Emanuel H. Knill
… This lecture was presented at the Workshop on Trapped Ion Quantum Computing hosted by NIST, February 21 - 24, 2006. … Workshop on Trapped Ion Quantum Computing hosted by NIST …

Patterning of Self-assembled Alkanethiol Monolayers on Silver by Microfocus Ion and Electron Beam Bombardment

April 1, 1994
Author(s)
John G. Gillen, Scott A. Wight, Joe Bennett, Michael J. Tarlov
… have been irradiated in selected areas by focused ion or electron bombardment. Subsequent immersion of the … attachment of this molecule to the silver surface in the ion or electron-exposed regions, producing a micrometer … areas was found to reach maximum levels of 70% at ion doses of 6×1013 ions/cm2 and 50% at electron doses of …
Displaying 751 - 775 of 4258
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