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 301 - 325 of 2904

High-Stability Single-Ion Clock with 5.5 x 10^-19 Systematic Uncertainty

July 14, 2025
Author(s)
Mason Marshall, Daniel Rodriguez Castillo, Willa Dworschack, Alexander Aeppli, Kyungtae Kim, Dahyeon Lee, William Warfield, Nicholas Nardelli, Tara Fortier, Jun Ye, David Ray Leibrandt, David Hume
… We report a single-ion optical atomic clock with fractional frequency … based on quantum logic spectroscopy of a single 27Al+ ion. A co-trapped 25Mg+ ion provides sympathetic cooling and quantum logic readout of … High-Stability Single-Ion Clock with 5.5 x 10^-19 Systematic Uncertainty …

Penning traps with unitary architecture for storage of highly charged ions

February 15, 2012
Author(s)
Joseph N. Tan, Samuel M. Brewer, Nicholas D. Guise
… beam-line available for extracting highly charged ions. We present a two-magnet architecture with radial access … as well as the collection of light emission by stored ions. Highly charged ions of neon and argon, extracted with initial energies 4000 … with unitary architecture for storage of highly charged ions …

Ion Energy Distributions and Sheath Voltages in Radio-Frequency-Biased, Inductively-Coupled, High-Density Plasma Reactor

April 1, 1999
Author(s)
Mark A. Sobolewski, James K. Olthoff, Yicheng Wang
… Ion energy distributions were measured at a grounded surface … frequency, radial position, inductive source power, and ion mass. The ground sheath voltage which accelerates the … the measurements provide a complete characterization of ion dynamics in the sheath, allowing ion transit time effects …

Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet

March 10, 2022
Author(s)
Qing Huang, R. Rawl, W. W. Xie, E. S. Chou, V. S. Zapf, X. X. Ding, C. Mauws, C. R. Wiebe, E. X. Feng, H. B. Cao, W. Tian, J. Ma, Yiming Qiu, Nicholas Butch, H. D. Zhou
… With the motivation to study how non-magnetic ion site disorder affects the quantum magnetism of … of Ba2.87Sr0.13CoSb2O9 with Sr doping on non-magnetic Ba2+ ion sites. The results show that Ba2.87Sr0.13CoSb2O9 exhibits … Ba3CoSb2O9, which demonstrates that the non-magnetic ion site disorder (the Sr doping) plays a complex role on the …

Trap-Integrated Superconducting Nanowire Single-Photon Detectors with Improved RF Tolerance for Trapped-Ion Qubit State Readout

April 24, 2023
Author(s)
Benedikt Hampel, Daniel Slichter, Dietrich Leibfried, Richard Mirin, Sae Woo Nam, Varun Verma
… State readout of trapped-ion qubits with trap-integrated detectors can address … that are integrated into linear surface-electrode rf ion traps. The shielded SNSPDs can be operated at applied rf … high-fidelity state readout of a wide range of trapped ion species in a typical cryogenic apparatus. …

Argon-Ion Treatment of Multi-Material Layered Surface-Electrode Traps for Noise Mitigation

November 28, 2025
Author(s)
Dustin Hite, Tobias Schaetz, Deviprasath Palani, Florian Hasse, Philip Kiefer, Frederick Bockling, Daniel Stick, Ulrich Warring
… Electric-field noise near ion-trap electrodes limits motional coherence and represents a key obstacle to scaling trapped-ion quantum systems. Here, we investigate how in situ Ar+ … precise control of material interfaces in next-generation ion-trap architectures. …

Trap-integrated superconducting nanowire single-photon detectors for trapped-ion qubit state readout

June 7, 2024
Author(s)
Benedikt Hampel, Daniel Slichter, Dietrich Leibfried, Richard Mirin, Varun Verma
… State readout of trapped-ion qubits is usually achieved by observing qubit-state-dependent fluorescence from the ion while driving an optical cycling transition with laser … of photon detectors for fluorescence detection into the ion trap itself may benefit the development of many-qubit …

Emission-Line Intensity Ratios in FeXVII Observed with a Microcalorimeter on an Electron Beam Ion Trap

December 1, 2000
Author(s)
J M. Laming, I Kink, E Takacs, James V. Porto, John D. Gillaspy, E Silver, H. Schnopper, Simon R. Bandler, N Brickhouse, S Murray, M Barbera, A K. Bhatia, G. A. Doschek, N. Madden, D Landis, J. Beeman, E. E. Haller
… Institute of Standards and Technology electron beam ion trap (EBIT) with a microcalorimeter detector. . . .Both … atoms, electron beam ion trap, emission-line intensity ratios, intensity ratios, … Observed with a Microcalorimeter on an Electron Beam Ion Trap …

Heavy Ion Induced Soft Breakdown of Thin Gate Oxides

December 1, 2001
Author(s)
J. F. Conley, John S. Suehle, A. H. Johnston, Bin Wang, T Miyahara, Eric M. Vogel, J B. Bernstein
… Heavy ion induced soft and hard breakdown are investigated in thin … reliability, radiation effects, soft breakdown, heavy ion irradiation, microelectronics … Heavy Ion Induced Soft Breakdown of Thin Gate Oxides …

Selectable Resistance-Area Product by Dilute Highly Charged Ion Irradiation

August 13, 2007
Author(s)
Joshua M. Pomeroy, Holger Grube, A C. Perrella, John D. Gillaspy
… from a single process recipe using highly charged ion (HCI) irradiation. The HCI irradiation occurs after … tunnel barrier. The neutralization of the highly charged ion on the tunnel barrier surface (Xe44+) ablates a small … Selectable Resistance-Area Product by Dilute Highly Charged Ion Irradiation …

Dielectronic resonances of LMn and LNn (? 4) series in highly-charged M-shell tungsten ions

March 4, 2020
Author(s)
Dipti Goyal, A. Borovik, Jr., R. Silwal, Joan M. Dreiling, Amy C. Gall, Endre Takacs, Yuri Ralchenko
… 4) dielectronic resonances (DR) in highly-charged M-shell ions of tungsten. The x-ray emission from W$^49+}$ through … resonances, Collisional-radiative modeling, M-shell ions. … and LNn (? 4) series in highly-charged M-shell tungsten ions …

Observations and identifications of extreme ultraviolet spectra of Ca-like to Na-like neodymium ions using an electron beam ion trap

August 23, 2023
Author(s)
Yang Yang, Dipti Dipti, Chihiro Suzukic, A. C. Gall, R. Silwal, Samuel Sanders, Joseph N. Tan, Aung S. Naing, Endre Takacs, Yuri Ralchenko
… Ca-like, Nd40+, through Nalike, Nd49+, highly charged ions have been measured at an electron beam ion trap (EBIT) facility at the National Institute of … EUV spectroscopy, neodymium, electron beam ion trap, collisional-radiative modeling, line identification … ultraviolet spectra of Ca-like to Na-like neodymium ions using an electron beam ion trap …

Measurement of Uranium-236 in Particles by Secondary Ion Mass Spectrometry

January 12, 2017
Author(s)
David S. Simons, John D. Fassett
… of the relative isotopic abundance by secondary ion mass spectrometry of 236U in uranium-containing material … hydride, isotope, isotopic abundance, particle, secondary ion mass spectrometry, SIMS, uranium … Measurement of Uranium-236 in Particles by Secondary Ion Mass Spectrometry …

Estimation of the critical external heat leading to the failure of lithium-ion batteries

June 29, 2020
Author(s)
Wei Tang, Andy Tam, Liming Yuan, Thomas Dubaniewicz, Richard Thomas, John Soles
… critical external heat leading to the failure of lithium-ion (Li-ion) batteries was conducted using an Accelerating Rate … Safety and Health (NIOSH). Several types of commercial Li-ion batteries were selected, including iron phosphate Li-ion … Lithium-ion battery, Accelerating Rate Calorimetry, Heat to failure, …

Electron-Impact Total Ionization Cross Sections of Hydrocarbon Ions

February 1, 2002
Author(s)
Karl K. Irikura, Yong Sik Kim, M A. Ali
… 6 + , and H 3 O + . The cross sections for the hydrocarbon ions are needed for modeling cool plasmas in fusion devices. … , CH 4 + , electron-impact ionization, H 3 O + , molecular ions … Total Ionization Cross Sections of Hydrocarbon Ions …

Measurements and Modeling of Ion Energy Distributions in High-Density, Radio-Frequency Biased CF 4 Discharges

May 1, 2002
Author(s)
Mark A. Sobolewski, Yicheng Wang, A N. Goyette
… Models of ion dynamics in radio-frequency (rf) biased, high-density plasma sheaths are needed to predict ion bombardment energies in plasma simulations. To test these models, we have measured ion energy distributions (IEDs) in pure CF 4 discharges at … CF4, high-density plasma, inductively coupled discharge, ion energy distribution, plasma processing, radio-frequency …

Relativistic CI calculations of spectroscopic data for the 2p6 and 2p53l configurationsin Ne-like ions between Mg III and Kr XXVII

October 10, 2013
Author(s)
P. Jonsson, P. Bengtsson, J. Ekman, S. Gustafsson, L. B. Karlsson, G. Gaigalas, D. Kato, Charlotte F. Fischer, I. Murakami, H. A. Sakaue, H. Hara, T. Watanabe, N. Nakamura, N. Yamamoto
… 2p53s, 2p53p, and 2p53d, configurations in all Ne-like ions between Mg III and Kr XXVII. Core-valence and core-core … data for the 2p6 and 2p53l configurationsin Ne-like ions between Mg III and Kr XXVII …

Equilibration of the planar modes of ultracold two-dimensional ion crystals in a Penning trap

May 11, 2020
Author(s)
Chen Tang, Athreya Shankar, Daniel Dubin, Dominic Meiser, Scott Parker, John J. Bollinger
… direct numerical simulations of ultracold two-dimensional ion crystals in a Penning trap with a rotating wall. The … in-plane modes and improve the performance of single plane ion crystals for quantum information processing. … of the planar modes of ultracold two-dimensional ion crystals in a Penning trap …

Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) for High-Throughput Characterization of Bio-Surfaces

January 1, 2003
Author(s)
S V. Roberson, A Sehgal, Albert J. Fahey, Alamgir Karim
… film. In this pre-liminary work, we tracked the secondary ion intensities of various species along the 45 mm length of … film. We noticed consistent trends, with the secondary ion signals for oxidized species steadily increasing with the … Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) for High-Throughput …

Changes in Lactate and Other Ions in Plaque and Saliva After a Fluoride Rinse and Subsequent Sucrose Administration

January 1, 2002
Author(s)
Gerald L. Vogel, Z Zhang, Laurence C. Chow, A L. Galvin
… studies showing a pH mediated increase in the latter ions, was due to salivary clearance or diffusive loss into … of the rinses. Similarly the site distribution of all ions appeared to be not only controlled by these factors … (fluoride, sucrose and water), as well as the clearance of ions into these components require further study if a …
Displaying 301 - 325 of 2904
Was this page helpful?