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Search Publications

NIST Authors in Bold

Displaying 576 - 600 of 2538

Solution Structures of Bacillus Anthracis Protective Antigen Proteins using Small Angle Neutron Scattering and Protective Antigen 63 Ion Channel Formation Kinetics

December 11, 2021
Author(s)
Ariel Michelman-Ribeiro, Kenneth A. Rubinson, Vitalii Silin, John J. Kasianowicz
… are studying the structures of bacterial toxins that form ion channels and catalyze macromolecule transport across … alpha-hemolysin, anthrax, Bacillus anthracis, β-barrel, ion channel, pore forming toxin, PA63, PA83 … Small Angle Neutron Scattering and Protective Antigen 63 Ion Channel Formation Kinetics …

Electrospray Tandem Quadrupole Fragmentation of Quinolone Drugs and Related Ions. On the Reversibility of Water Loss from Protonated Molecules

November 30, 2010
Author(s)
Pedatsur Neta, Bhaskar Godugu, Yuxue Liang, Yamil Simon, Xiaoyu Yang, Stephen E. Stein
… The authors suggested formation of two singly protonated ions with different behavior, one undergoing loss of H 2 O … cone voltage as well. We further find that many fragment ions formed by loss of H 2 O can attach a water molecule in the collision cell, whereas ions formed by loss of CO 2 do not. Since re-attachment of H …

Filtering noise with a quantum probe

May 5, 2011
Author(s)
John J. Bollinger
… in general terms the ideas behind the manuscript "Single-ion quantum lock-in amplifier" by Kotler and colleagues which … of the valence electron spin of a single trapped strontium ion. … dynamical decoupling, ion trap, lock-in detection, quantum metrology, quantum …

Fundamental constants and tests of theory in Rydberg states of one-electron ions

March 19, 2010
Author(s)
Ulrich D. Jentschura, Peter Mohr, Joseph N. Tan
… of the theory of circular Rydberg states of hydrogenlike ions allows highly-accurate predictions to be made for energy … can be increased by utilizing a variety of combinations of ions and Ryberg states to determine fundamental constants and … and tests of theory in Rydberg states of one-electron ions …

Entropic modulation of divalent cation transport

September 22, 2025
Author(s)
Yechan Noh, Demian Riccardi, Alexander Smolyanitsky
… enthalpic contributions from transiently decreased ion-solvent and increased ion-pore electrostatic interactions. This commonly accepted … ion transport, thermodynamics, entropy, enthalpy, theory, …

Visible, EUV, and X-Ray Spectroscopy at the NIST EBIT Facility

April 24, 2004
Author(s)
John D. Gillaspy, B Blagojevic, Paul A. Dalgarno, K Fahey, V Kharchenko, J M. Laming, L Logosi, E-O Le Bigot, K Makonyi, L P. Ratliff, E Silver, H. Schnopper, E Takacs, J N. Tan, H Tawara, K Tokesi
… astrophysics, charge exchange, electron beam ion trap, EUV lithography, exreme ultraviolet, fusion, highly …

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

May 15, 2000
Author(s)
Drago Skrtic, Joseph M. Antonucci, E D. Eanes
… as the Gibbs free energy, DGo. Elevated Ca2+ and PO4 ion concentrations were sustained in all BTHZ and UH resins. … potential due to the resin retention of released Ca2+ via ion binding by carboxylic acid groups of PMGDMA. … Hybridization of the fillers had no effect on the ion release from BTHZ composites. However, internal …

Characterization of Drug-Eluting Stent (DES) Materials With Cluster Secondary Ion Mass Spectrometry (SIMS)

July 1, 2006
Author(s)
Christine M. Mahoney, Martin McDermott
… Secondary Ion Mass Spectrometry (SIMS) employing an SF5+ polyatomic primary ion source was utilized to analyze several materials commonly … molecular signal as a function of increasing SF5+ primary ion dose when experiments were performed at cryogenic … Drug-Eluting Stent (DES) Materials With Cluster Secondary Ion Mass Spectrometry (SIMS) …

Charge-exchange processes in EBIT: implications for spectral analysis of few-electron Fe ions

April 16, 2025
Author(s)
Yang Yang, FNU Dipti, Amy Gall, Nancy Brickhouse, Hunter Staiger, Galen O'Neil, Paul Szypryt, Adam Foster, David Schultz, Aung Naing, Joseph Tan, Daniel Swetz, Michael Fogle, Randall Smith, Yuri Ralchenko, Endre Takacs
… present measured and simulated spectra of few-electron Fe ions, where we used a single charge-exchange factor to reduce … implications for spectral analysis of few-electron Fe ions …

Cation Diffusion at the Polymer Coating/Metal Interface.

January 1, 1995
Author(s)
Tinh Nguyen, Z Zhang, C Lin, J M. Pommersheim
Theoretical and experimental studies were carried out on the transport of cations in the channel between a polymer coating and a metal substrate from a defect in the absence of an applied electrical potential. The model consists of two stages: an initial

Effect of Cluster Ion Analysis Fluence on Interface Quality in SIMS Molecular Depth Profiling

November 10, 2009
Author(s)
Christopher Szakal, Steven Hues, J Greg Gillen, Joe Bennett
… Cluster ion beams are being routinely utilized in secondary ion mass spectrometry (SIMS) for molecular depth profiling … as soft organic matrices, often require large analysis ion fluences in order to generate sufficient count rates for … Effect of Cluster Ion Analysis Fluence on Interface Quality in SIMS Molecular …

Observation of the 1 S 0 - 3 P 0 clock transition in 27 Al +

June 1, 2007
Author(s)
Till P. Rosenband, P. O. Schmidt, David Hume, Wayne M. Itano, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Jeroen Koelemeij, James C. Bergquist, David J. Wineland
… 0 – 3 P 0 clock transition in 27 Al + . A single aluminum ion and a single beryllium ion are simultaneously confined in a linear Paul trap, … Coulomb repulsion. This coupling allows the beryllium ion to sympathetically cool the aluminum ion, and also …

Lateral Magnetically Modulated Multilayers by Combining Ion Implantation and Lithography

March 1, 2017
Author(s)
Enric Menendez, Hiwa Modarresi, Claire Petermann, Josep Nogues, Neus Domingo, Haoliang Liu, Brian Kirby, Amir Syed Mohd, Zahir Salhi, Earl Babcock, Stefan Mattauch, Chris Van Haesendonck, Andre Vantomme, Kristiaan Temst
… The combination of lithography and ion implantation is demonstrated to be a suitable method to … and Co-CoO (2.4υm-wide) lines has been obtained by oxygen ion implantation into a lithographically-masked Au-sandwiched … Lateral Magnetically Modulated Multilayers by Combining Ion Implantation and Lithography …

Frequency-comb spectroscopy on pure quantum states of a single molecular ion

March 27, 2020
Author(s)
Chin-wen Chou, Alejandra L. Collopy, Christoph Kurz, Yiheng Lin, Michael E. Harding, Philipp N. Plessow, Tara M. Fortier, Scott A. Diddams, Dietrich G. Leibfried, David R. Leibrandt
… techniques to prepare a single trapped molecular ion in a pure quantum state, drive terahertz rotational … spectroscopy on pure quantum states of a single molecular ion …

Detection and Speciation of Brominated Flame Retardants in High-Impact Polystyrene (HIPS) Polymers

March 27, 2012
Author(s)
Richard D. Holbrook, Jeffrey M. Davis, Keana C. Scott, Christopher W. Szakal
… micro X-ray Fluorescence Spectroscopy (µXRF), Focused Ion Beam Scanning Electron Microscopy (FIB SEM) combined with … X-ray Spectroscopy (EDS), and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), are promising techniques … "Brominated Flame Retardants", "Focused Ion Beam Scanning Electron Microscopy", "Secondary Ion Mass …

High Resolution Atomic Spectroscopy of Laser-Cooled Ions

January 1, 1991
Author(s)
David J. Wineland, James C. Bergquist, John J. Bollinger, Wayne M. Itano, F L. Moore, J M. Gilligan, M G. Raizen, C S. Weimer, C H. Manney
… Enrico Fermi Summer School Laser Manipulation of Atoms and Ions August 1991 Pages … High Resolution Atomic Spectroscopy of Laser-Cooled Ions …

Quantum interference between photons from an atomic ensemble and a remote atomic ion

November 18, 2019
Author(s)
A. Craddock, J. Hannegan, D. Ornelas-Huerta, J. Siverns, A. Hachtel, E. Goldschmidt, James V. Porto, Q. Quraishi, S. Rolston
… interference between photons generated from a single ion and an atomic ensemble. The photons are produced on … Given these results, we analyze the feasibility of hybrid ion-ensemble remote entanglement generation. … photons from an atomic ensemble and a remote atomic ion …

Ratio of the Al + and Hg + Optical Clock Frequencies to 17 Decimal Places

August 25, 2008
Author(s)
Wayne M. Itano, Till P. Rosenband, David Hume, P.O. Schmidt, Chin-Wen Chou, A. Brusch, Luca Lorini, Windell Oskay, Robert E. Drullinger, Sarah Bickman, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, William C. Swann, Nathan R. Newbury, David J. Wineland, James C. Bergquist
… for state preparation and detection. Coupling with a Be + ion, trapped simultaneously with the Al + ion, enables state manipulation, detection, and cooling of the Al + ion. Both standards have achieved absolute reproducibilities … atomic clocks, frequency standards, fundamental constants, ion traps, mercury, optical frequency standards …
Displaying 576 - 600 of 2538
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