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Displaying 1176 - 1200 of 2769

Creation of an Ultracold Neutral Plasma

December 1, 1999
Author(s)
T C. Killian, S Kulin, S D. Bergeson, Luis A. Orozco, C R. Orzel, S L. Rolston
… is evident in the trapping of electrons by the positive ion cloud when the Debye screening length becomes smaller …

Simulation study of the capacitance and charging mechanisms of ionic liquid mixtures near carbon electrodes

January 4, 2019
Author(s)
Alta Y. Fang, Alexander Y. Smolyanitsky
… planar graphene sheets as electrodes. We demonstrate that ion-electrode van der Waals attractions play an important … the two pure ionic liquids. We characterize cumulative ion densities near electrodes carrying various surface … in the ionic liquid mixtures we identify an effective ion exchanging mechanism wherein charging of the electrodes …

Unexpected Gas-Phase Nitrogen-Oxygen Smiles Rearrangement: CID of Deprotonated 2-(N-Methylanilino)ethanol and Morpholinylbenzoic Acid Derivatives

October 21, 2022
Author(s)
Yuxue Liang, Yamil Simon, Pedatsur Neta, Stephen E. Stein
… a five-membered ring rearrangement to form a phenoxide ion C6H5O-. When R = H, such a Smiles rearrangement is … an anilide anion (C6H5NH-, m/z 92) rather than a phenoxide ion (C6H5O-, m/z 93.0343). However, when the amino hydrogen … Smiles rearrangement does occur, leading to the phenoxide ion, as the negative charge can only reside on the oxygen …

Large variations in the composition of ionic liquid-solvent mixtures in nanoscale confinement

July 9, 2019
Author(s)
Alta Y. Fang, Alexander Y. Smolyanitsky
… pore widths only slightly larger than the sizes of bare ion or solvent molecules. The composition of the electrolyte … very narrow pores, while for pore widths close to the bare ion sizes we observe an in-pore ionic liquid mole fraction … of ions from the pore or a slight depletion of ions, while ion population again increases as pore width further …

A trapped human PPM1A-phosphopeptide complex reveals structural features critical for regulation of PPM protein phosphatase activity

May 24, 2018
Author(s)
Subrata Debnath, Dalibor Kosek, Harichandra Tagad, Stewart R. Durell, Daniel Appella, Roderico Acevedo, Alexander Grishaev, Fred Dyda, Ettore Appella, Sharlyn Mazur
… two tightly bound metal ions and an additional third metal ion in the active site. Here, the crystal structure of the … confirmed the presence of the anticipated third metal ion in the active site of metazoan PPM phosphatases. … between the bound substrate and the labile metal ion. This work illuminates the structural and thermodynamic …

Molecular Oxygen (O2) Artifacts in Tandem Mass Spectra

November 20, 2024
Author(s)
Yuxue Liang, Pedatsur Neta, Xiaoyu (Sara) Yang, Hugo Garraffo, Tallat Bukhari, Yi Liu, Stephen Stein
… peak that could only be assigned to a peroxyl radical ion. For example, some protonated iodo-aromatics lose iodine … which reacts with O2 to generate a peroxyl radical ion [M+H-I+O2]+·. To confirm the O2 adduction, five compounds … radical peaks, which become dominant while the precursor ion peaks are consumed. The correlation of the peroxyl …

Energetics of Li Atom Displacements in K1-xLixTa03: First-Principles Calculations

July 1, 2003
Author(s)
S A. Prosandeev, Eric J. Cockayne, Benjamin P. Burton
K 1-xLi xTaO 3 (KLT) solid solutions exhibit a variety of interesting physical phenomena related to large local displacements of Li-ions from ideal perovskite A-site positions. First-principles calculations for KLT supercells were used to investigate these

Lattice damage in superconducting microcalorimeter detectors

June 3, 2013
Author(s)
Robert D. Horansky, Joel N. Ullom, Michael W. Rabin
… in using superconducting detectors for measurement of ion kinetic energies. Unprecedented resolution is possible … we will calculate the expected resolution limits due to ion damage, as well as use the Monte Carlo simulation SRIM to …

Competition Between the Inter- and Intra-sublattice Interactions in Yb 2 V 2 O 7

February 27, 2015
Author(s)
Z. L. Dun, J. Ma, H. B. Cao, Yiming Qiu, John R. Copley, T. Hong, M. Matsuda, J. G. Cheng, M. Lee, E. S. Choi, S. Johnston, H. D. Zhou
We studied single crystals of Yb 2V 2O 7 using dc and ac susceptibility measurements, elastic and inelastic neutron scattering measurements, and linear spin wave theory. The experimental data shows a ferromagnetic ordering of V 4+ ions at 70 K, a short

Quamtum coherence between two atoms beyond Q=10 15

April 22, 2011
Author(s)
Chin-Wen Chou, David Hume, Michael J. Thorpe, David J. Wineland, Till P. Rosenband
… quantum states of two Al+ ions in an Al+ -Al+ -Mg+ linear ion chain without spatially resolving the ions. …

Effect of Hydrogen on Pb(Zr,Ti)O 3 -Based Ferroelectric Capacitors

October 1, 1998
Author(s)
S R. Perusse, C W. Tipton, H D. Drew, T Venkatesan, R Ramesh, D B. Romero, V B. Podobedov, A Weber
… properties and Raman spectra. We propose that the hydrogen ion is bonded with one of the apical oxygen ions and prevents the Ti ion from switching. Pyroelectric measurements on forming …

ToF-SIMS Analysis of Ultrathin Films and Their Fragmentation Patterns

February 8, 2024
Author(s)
Shin Muramoto, Daniel Graham, David Castner
… in thickness from 1 to 20 nm, and time-of-flight secondary ion mass spectrometry coupled with principal component … cluster induced non-linear enhancement in secondary ion yield is no longer observed; extent of fragmentation is higher due to confinement of the primary ion energy; and the size of the primary ion source also …

Structural and Dynamical Behaviors of Fast Ionic Conducting Potassium nido -(Carba)borates

August 21, 2025
Author(s)
Mads B. Amdisen, Hui Wu, Mikael S. Andersson, Mirjana Dimitrievska, Wei Zhou, Torben R. Jensen, Craig Brown, Juscelino Leao, Terrence J. Udovic
… fluid anions are concomitant with fast potassium-ion conductivity. The highest ionic conductivity is observed … solid state battery, fast-ion conduction, crystal structure determination, neutron …

Instrumentation, Metrology, and Standards for Nanomanufacturing

September 10, 2007
Author(s)
Michael T. Postek, Andras Vladar, John A. Kramar, L A. Stern, John Notte, Sean McVey
… Helium Ion Microscopy (HIM) is a new, potentially disruptive … the helium ions, it is theoretically possible to focus the ion beam into a smaller probe size relative to that of an … voltage and materials involved. Conversely, the helium ion beam interacts with the sample, but it does not have as …
Displaying 1176 - 1200 of 2769
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