U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 726 - 750 of 2769

Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger Cat

January 1, 1999
Author(s)
David J. Wineland, C Monroe, Wayne M. Itano, D Kielpinski, B E. King, C J. Myatt
… at NIST to implement quantum computation using trapped ions, based on a scheme proposed by J.I. Cirac and P. Zoller … Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger Cat …

Molecular Mass Determination of Saturated Hydrocarbons: Reactivity of eta- 5 -Cyclopentadienylcobalt Ion (CpCo. +) and Linear Alkanes up to C-30

January 1, 2003
Author(s)
H M. Byrd, Kathleen M. Flynn, D P. Ridge
… the feasibility of the h 5 -cyclopentadienylcobalt ion (CpCo +) as a suitable cationization reagent for saturated hydrocarbons analysis by mass spectrometry. Ion/molecule reactions of CpCo + and three medium … n-alkanes were examined using Fourier-transform ion cyclotron resonance mass spectrometry. Second-order rate …

Frequency Measurements of Al+ and Hg+ Optical Standards

June 8, 2009
Author(s)
Wayne M. Itano, James C. Bergquist, Till P. Rosenband, David J. Wineland, David Hume, Chin-wen Chou, Steven R. Jefferts, Thomas P. Heavner, Tom Parker, Scott Diddams, Tara Fortier
… aluminum ion, mercury ion, optical frequency standards, time variation of fundamental constants, trapped ion frequency standards …

Temperature-Controlled Depth Profiling in Polymeric Biomaterials Using Cluster Secondary Ion Mass Spectrometry

July 1, 2006
Author(s)
Christine M. Mahoney, Albert J. Fahey, John G. Gillen, Chang Xu, J Batteas
… Secondary Ion Mass Spectrometry (SIMS) employing an SF5+ polyatomic primary ion source was used to depth profile through various … rates, damage cross sections, and overall secondary ion stability) were monitored as a function of temperature. … in Polymeric Biomaterials Using Cluster Secondary Ion Mass Spectrometry …

Ab Initio Study of the Reactions Between a Series of Substituted Singlet Nitrenium Ions and Water

October 12, 2021
Author(s)
A A. Restrepo-Cossio, M Marquez, F Mari, Carlos A. Gonzalez
… the reactions of a series of substituted singlet nitrenium ions ( 1 [R-N-H] + , R=H, Cl, F, CN and Me) and water in gas … It was found that in gas phase and solution the nitrenium ions react in a barrierless fashion to produce an ylide-like … Between a Series of Substituted Singlet Nitrenium Ions and Water …

An 27 Al+ quantum-logic clock with systematic uncertainty below 10 -18

July 15, 2019
Author(s)
Samuel M. Brewer, Jwo-Sy Chen, Aaron M. Hankin, Ethan Clements, Chin-wen Chou, David J. Wineland, David Hume, David Leibrandt
… a frequency stability of 1.2 X 10 -15 /(T 1/2 ). A 25 Mg + ion is simultaneously trapped with the 27 Al + ion and used for sympathetic cooling and state readout during … to previous 27Al+ clocks, enabling clock operation with ion motion near the three-dimensional ground state. Operating …

Quantum interface between an electrical circuit and a single atom

March 30, 2012
Author(s)
Jacob M. Taylor, Dvir Kafri, David Kielpinski, G J. Milburn, M J. Woolley
… devices using the coupling between the motion of a single ion and the quantised electric field of the circuit. … coupling between the internal states of a single atomic ion and the electrical excitations of a superconducting … Ion traps, superconducting resonator, bulk acoustic waves …

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 …

Physicochemical characterization and in vitro hemolysis evaluation of silver nanoparticles

June 7, 2011
Author(s)
Vytautas Reipa, Jonghoon Choi, Nam S. Wang, Victoria M. Hitchins, Peter L. Goering, Robert Malinauskas
… ions released from the particles were measured using an ion-selective electrode and inductively coupled plasma mass … were mixed with heparinized human blood diluted in phosphate buffered saline. Silver nanoparticles (diameter 10 …

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 …

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 …

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 …

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) …

A Thermodynamic Investigation of Reactions Catalyzed by Tryptophan Synthase

July 27, 1998
Author(s)
N Kishore, Yadu D. Tewari, D Akers, Robert N. Goldberg, E. W. Miles
… pyruvate(aq) + ammonia(aq),indole(aq) + D-glyceraldehyde 3-phosphate(aq) = 1-(indol-3-yl)glycerol 3-phosphate(aq),L-serine(aq) + 1-(indol-3-yl)glycerol 3-phosphate(aq) = L-tryptophan(aq) + D-glyceraldehyde …

Polyelectrolyte Adsorption on Hydroxyapatite

November 1, 2001
Author(s)
Vincent A. Hackley
… and chemically related, sparingly soluble calcium phosphate (CP) salts [1], and is the structural prototype for … Amelogenin proteins, for instance, modulate calcium phosphate precipitation and growth during the development of …
Displaying 726 - 750 of 2769
Was this page helpful?