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Search Publications

NIST Authors in Bold

Displaying 551 - 575 of 4258

On the Risk of False Positive Identification Using Multiple Ion Monitoring in Qualitative Mass Spectrometry: Large-Scale Intercomparisons With a Comprehensive Mass Spectral Library

June 1, 2006
Author(s)
Stephen E. Stein, David N. Heller
… out by comparing a few selected ions acquired by multiple ion monitoring (MIM), with due allowance for expected … roughly one order of magnitude for each additional ion selected. Our computations also showed that false … identification, mass spectral library, multiple ion monitoring (MIM), qualitative mass spectrometry …

A Critical Compilation of Experimental Data on the 1s2l2l0 Core-Excited States of Li-like Ions from Carbon to Uranium

October 7, 2022
Author(s)
Yuri Ralchenko, Alexander Kramida, Vladimir Azarov
… of energy levels of the 1s2l2l0 core-excited states for ions along the Li isoelectronic sequence from carbon to … levels of the 1s2l2l0 core-excited states of Li-like ions. The compiled experimental data include uncertainty … Spectroscopy, Energy Levels, Transition Energies, Li-like ions, Critical Compilation, Core-Excited States …

A Critical Compilation of Experimental Data on the 1s2l2l0 Core-Excited States of Li-like Ions from Carbon to Uranium

May 25, 2022
Author(s)
V. I. Azarov, Alexander Kramida, Yuri Ralchenko
… of energy levels of the 1s2l2l' core-excited states for ions along the Li isoelectronic sequence from carbon to … levels of the 1s2l2l' core-excited states of Li-like ions. The compiled experimental data include uncertainty … Spectroscopy, Energy Levels, Transition Energies, Li-like ions, Critical Compilation, Core-Excited States …

Solvation Structure of Ions in Water

February 14, 2007
Author(s)
Raymond D. Mountain
… Molecular dynamics simulations of ions in water are reported for solutionsof varying solute … trends inproperties as the size and charge density of the ions changes.The emphasis is on how the structure of water is modified by the presenceof the ions and how many water molecules are present in the first …

High Fidelity Universal Gate Set for 9Be+ Ion Qubits

August 4, 2016
Author(s)
John P. Gaebler, Ting R. Tan, Yong Wan, Yiheng Lin, Ryan S. Bowler, Adam C. Keith, Scott Glancy, Kevin Coakley, Emanuel Knill, Dietrich Leibfried, David J. Wineland
… High Fidelity Universal Gate Set for 9Be+ Ion Qubits …

NIST 38. NIST Spectroscopic Properties of Atoms and Atomic Ions Database

October 16, 2008
Author(s)
J R. Rumble
… The NIST Spectroscopic Properties of Atoms and Atomic Ions Database provides listings of prominent air or vacuum … atomic ions, atomic physics, atomic spectroscopy, energy levels, … NIST 38. NIST Spectroscopic Properties of Atoms and Atomic Ions Database …

Calcium and phosphate ion releasing composite: Effect of pH on release and mechanical properties

October 27, 2008
Author(s)
Hockin D. Xu, Michael Weir, Limin Sun
… “smart” to increase the calcium (Ca) and phosphate (PO4) ion release at cariogenic pH. Methods. TTCP was ball-milled … level mass fractions varied from 0% to 75%. Ca and PO4 ion release were measured vs. time at pH of 7.4, 6, and 4. … mechanical properties, tooth caries inhibition, Ca and PO4 ion release …

Large T1 contrast enhancement using superparamagnetic nanoparticles in ultra-low field MRI

June 5, 2018
Author(s)
Xiaolu Yin, Stephen E. Russek, Gary Zabow, Fan Sun, Jeotikanta Mohapatra, Kathryn E. Keenan, Michael A. Boss, Hao Zeng, Sy-Hwang Liou, John M. Moreland
… Superparamagnetic iron oxide nanoparticles (SPIONs) are widely investigated and … advantages of enhanced signal, shorter imaging times, and iron-oxide based nontoxic biocompatible agents. This approach … ultra-low field MRI, MRI contrast agents, Superparamagnetic iron oxide nanoparticles …

Binding Energies in Atomic Negative Ions: III

November 14, 2018
Author(s)
T Andersen, H K. Haugen, H Hotop
… splittings and excited state energies of negative ions as well as lifetimes of metastable states are given. … ab initio calculations, atomic negative ions, binding energy, electron affinity, excited states, … Binding Energies in Atomic Negative Ions: III …

Optimal transport and colossal ionic mechano-conductance in graphene crown ethers

July 12, 2019
Author(s)
Subin Sahu, Justin E. Elenewski, Christoph Rohmann, Michael P. Zwolak
… Biological ion channels balance electrostatics and hydration, yielding large ion selectivities alongside high transport rates. These … transport conditions. Crown ethers are known for selective ion adsorption. When embedded in graphene, however, transport … Ion transport, Nanopores, Ion channels, Crown ether …

Ion Storage Group Website

January 1, 1997
Author(s)
Wayne M. Itano, B E. King, John J. Bollinger, D J. Berkeland
… http://tf.nist.gov/ion/index.htm … Ion Storage Group Website …

NMR Spectroscopy and Multiscale Modeling Shed Light on Ion-Solvent Interactions and Ion Pairing in Aqueous NaF Solutions

September 10, 2024
Author(s)
Gosia Musial, Demian Riccardi, Chris Suiter, Ethan Sontarp, Samantha Miller, Robert Lirette, Kyle Covington-Rehmeier, Avik Mahata, Chris Muzny, Angela Stelson, Kathleen Schwarz, Jason A. Widegren
… The balance between ion solvation and ion pairing in aqueous solutions modulates chemical and … quantitative determination of the distribution of ion-solvation and ion-pairing states remains elusive. Here, … NMR Spectroscopy and Multiscale Modeling Shed Light on Ion-Solvent Interactions and Ion Pairing in Aqueous NaF …

Loss of 45 Da from a2 Ions and Preferential Loss of 48 Da from a2 Ions Containing Methionine in Peptide Ion Tandem Mass Spectra

January 29, 2011
Author(s)
Yamil Simon, Pedatsur Neta, Xiaoyu Yang, Stephen E. Stein
… which correspond to a neutral loss of 45 Da from a 2 ions. From exact mass analysis this loss is ascribed to … formamide (or NH 3 +CO). Elimination of formamide from a 2 ions requires that the ions cyclize. A mechanism for this … other neutral losses, such as H 2 O. However, if the a 2 ion contains methionine, a neutral loss of 48 Da, ascribed to …

Detection and identification of sugar alcohol sweeteners by ion mobility spectrometry

June 23, 2016
Author(s)
Thomas Forbes, Edward Sisco, Christopher Browne
… of sugar alcohols sweeteners was demonstrated using ion mobility spectrometry (IMS). IMS provides a valuable … Ion mobility spectrometry, Sugar alcohols, Alternative … Detection and identification of sugar alcohol sweeteners by ion mobility spectrometry …

Experimental Uhrig Dynamical Decoupling Using Trapped Ions

June 25, 2009
Author(s)
Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M. Itano, John J. Bollinger
… Our qubit system consists of a crystalline array of 9 Be + ions confined in a Penning trap. We use an electron-spin-flip … Experimental Uhrig Dynamical Decoupling Using Trapped Ions …

Data for secondary electron production from ion precipitation at Jupiter II: Simultaneous and non-simultaneous target and projectile processes in collisions of Oq+ + H2 (q=0-8)

March 15, 2019
Author(s)
David R. Schultz, Heman Gharibnejad, Thomas Cravens, Stephen Houston
… the effects of secondary electrons produced by energetic ion precipitation at Jupiter, we extend the treatment to … this expanded set of processes, we show, via Monte Carlo ion transport simulation, that improved respresentation of … can improve modeling of the energy deposition by oxygen ion precipitation in an H2 atmosphere, providing a more …
Displaying 551 - 575 of 4258
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