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Displaying 326 - 350 of 4633

A Coaxial-Resonator Driven rf(Paul)-Trap for Strong Confinement

January 1, 1995
Author(s)
Steven R. Jefferts, C Monroe, E W. Bell, David J. Wineland
… We describe a variant of the quadrupole rf (Paul) ion trap capable of localization of a trapped ion to much less … driven at about 240 MHz. The binding strength of the trap has been characterized. The trap contains compensation electrodes which allow the … A Coaxial-Resonator Driven rf(Paul)-Trap for Strong Confinement …

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 …

A Four-Zone Furnace for Realization of Silver and Gold Freezing Points

September 1, 2003
Author(s)
Dean C. Ripple, K Garrity, Christopher W. Meyer
… of ITS-90 freezing points of aluminum, silver, and gold. When using a fixed-point cell mounted in a long … the heat-pipe lifetime is limited when used at the gold point (1064.18 C) for more than a few hundred hours. To … fixed point, furnace, gold, ITS-90, silver, temerpature …

Impact of the Trapping of Anode Hot Holes on Silicon Dioxide Breakdown

November 1, 2002
Author(s)
Eric M. Vogel, Da-Wei Heh, J B. Bernstein
… as the temperature during stress is increased, less hole trapping is observed whereas the charge-to-breakdown of the oxide is decreased. The results show that although the trapping of hot holes injected using anode hole injection may … in silicon dioxide, breakdown can not be limited by hole trapping. …

Toward improved quantum simulations and sensing with trapped two-dimensional ion crystals via parametric amplification

March 29, 2023
Author(s)
Matthew Affolter, Wenchao Ge, Bryce Bullock, Shaun Burd, Kevin Gilmore, Jennifer Lilieholm, Allison Carter, John J. Bollinger
… in quantum simulation and sensing experiments with trapped ions. Here we discuss, experimentally demonstrate, … Toward improved quantum simulations and sensing with trapped two-dimensional ion crystals via parametric amplification …

Measurement of the 2P1/2-2P3/2 fine structure splitting in fluorine-like Kr, W, Re, Os and Ir

September 2, 2020
Author(s)
Galen O'Neil, Samuel C. Sanders, Paul Szypryt, Dipti Goyal, Amy Gall, Yang Yang, Samuel M. Brewer, William Doriese, Joseph Fowler, Daniel Swetz, Joseph Tan, Joel Ullom, Andrey V. Volotka, Endre Takacs, Yuri Ralchenko
… energy in F-like ions using the NIST electron beam ion trap and extreme-ultraviolet and x-ray spectrometers. Good … electrodynamics, fine structure splitting, electron beam ion trap, x-ray spectrometers …

Dynamics in a Two-Level Atom Magneto-Optical Trap

July 1, 2002
Author(s)
X Xu, T Loftus, M J. Smith, John L. Hall, Alan Gallagher, Jun Ye
… present an ideal platform for exploring magneto-optic trap (MOT) dynamics, enabling unique and definitive tests of … beam intensity, detuning, magnetic-field, gradient, trap density, and lifetime dependence of the spring constant … of K and α provide a unified and consistent picture of trap dynamics that agrees with Doppler cooling theory at the …

Ion-Molecule Reactions and Ion Kinetics in DC Townsend Discharges in Dielectric Gases

January 1, 1999
Author(s)
MVVS. Rao, James K. Olthoff
… and kinetic energies of ions are determined by ion-molecule collisions experienced by ions as they are … as charge-exchange collisions, collisional detachment, and ion conversion, we have measured the kinetic-energy … measurements, and the effective cross sections for the ion-molecule reactions, in some cases, may be calculated. The …

Synthesis and Characterization of Cobalt/Gold Bimetallic Nanoparticles

April 1, 2007
Author(s)
Guangjun Cheng, Angela R. Hight Walker
… Cobalt/gold (Co/Au) bimetallic nanoparticles are prepared by … bimetallic nanoparticle, cobalt nanoparticles, cobalt/gold, magnetic nanoparticles, magnetic properties … Synthesis and Characterization of Cobalt/Gold Bimetallic Nanoparticles …

Trapping atoms using nanoscale quantum vacuum forces

July 10, 2014
Author(s)
Jacob M. Taylor, Darrick E. Chang, Kanupriya Sinha, H J. Kimble
… to tailor the vacuum forces themselves to provide strong trapping potentials. The trapping scheme takes advantage of the attractive ground … Casimir force, atom trapping, laser cooling … Trapping atoms using nanoscale quantum vacuum forces …

Controlled Formation and Characterization of Dithiothreitol-Conjugated Gold Nanoparticle Clusters

March 5, 2014
Author(s)
De-Hao D. Tsai, Tae Joon Cho, Frank W. DelRio, Justin Gorham, Jiwen Zheng, Jiaojie Tan, Michael R. Zachariah, Vincent A. Hackley
… study of the controlled formation of discrete-size gold nanoparticle clusters (GNCs) by interaction with the … Results show that DTT increases the aggregation rate of gold nanoparticles (AuNPs) up to ≈ 100×. A mixed conformation … Gold, nanoparticle, cluster, aggregate, dimer, …

Conformational Nature of DNAGrafted Chains on Spherical Gold Nanoparticles

September 10, 2016
Author(s)
Jack F. Douglas, Fernando Vargas-Lara
… DNA chains (ss-DNA) grafted onto spherical symmetric gold nanoparticles (NPs) and of the grafted layer as a whole … NPs (Rh) from the hydrodynamic radius of the bare gold NP core (R = 5:0 nm) for a range of grafted chains (N), … gold nanoparticle, single-stranded DNA, chain grafting, …
Displaying 326 - 350 of 4633
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