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Search Publications

NIST Authors in Bold

Displaying 801 - 825 of 3757

Measurement of the Kr XVIII 3d 2D5/2 lifetime in a Unitary Penning Trap

April 24, 2014
Author(s)
Nicholas D. Guise, Joseph Tan, Samuel Brewer, Charlotte F. Fischer, P. Jonsson
… trapping volume. Kr17+ ions produced in an electron beam ion trap (EBIT) are extracted and captured in this unitary … that is about a factor of 102 lower than in the EBIT ion source. The 637 nm photons emitted by the captured Kr … Ion trapping, Atomic spectroscopy, Atomic Physics …

Fragmentation of Leucine Enkephalin as a Function of Laser Fluence in a MALDI TOF-TOF

April 2, 2007
Author(s)
Jennifer M. Campbell, Stephen Stein, Paul S. Blank, Jonathan Epstein, Marvin L. Vestal, Alfred L. Yergey
… The effects of laser fluence on ion formation in MALDI was studied using a tandem TOF mass … followed over laser fluence ranging from the threshold of ion formation to the maximum available, i.e., approximately … data suggest the presence of two distinct environments for ion formation. One is associated with molecular desorption at …

Characterizing the ZrBe 2 H x Phase Diagram via Neutron Scattering Methods

January 1, 2023
Author(s)
Hui Wu, Wei Zhou, Terrence J. Udovic, Jr. Bowman, Bjorn C. Hauback
… with hexagonal P6/mmm symmetry that undergoes some type of hydrogen sublattice ordering below 200 K (235-250 K for ZrBe … spectroscopy measurements of ZrBe d2^H x at lower hydrogen contents (x … ZrBe2, intermetallic hydrides, hydrogen storage materials, neutron diffraction, neutron …

Architecture for a Large-Scale Ion-Trap Quantum Computer

January 1, 2002
Author(s)
D Kielpinski, C R. Monroe, David J. Wineland
… being explored for quantum computers are systems utilizing ion traps, in which quantum bits (qubits) are formed from the … on using quantum communication to link a number of small ion- trap quantum systems. Developing the array-based … subspaces significantly reduces decoherence during ion transport, and removes the requirement of clock …

Comparison of Mg-based liquid metal ion sources for scalable focused-ion-implantation doping of GaN

April 18, 2024
Author(s)
Aaron Katzenmeyer, Michael Titze, Sam Frisone, Tony Ohlhausen, Anthony Flores, Deanna Campbell, Bingjun Li, Yongqiang Wang, Jung Han, Edward Bielejec, Rachel Goldman
… suitability of various magnesium-based liquid metal alloy ion sources (LMAIS) for scalable focused-ion-beam (FIB) implantation doping of GaN. We consider GaMg, … Mg depth profile data from Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). We also provide insight …

Heavy ion space radiation triggers ongoing DNA base damage by downregulating DNA repair pathways

July 7, 2020
Author(s)
Shubhankar Suman, Pawel Jaruga, M Miral Dizdar, Albert J. Fornace, Jr., Datta Kamal
… particle radiation especially to highly damaging heavy ion radiation, which poses considerable risk to astronauts' … diseases including gastrointestinal diseases after heavy ion radiation exposure during space travel. … Heavy ion space radiation, DNA damage and repair, oxidative stress, …

Density Functional Theory Meta GGA Study of Water Adsorption in MIL-53(Cr)

July 16, 2019
Author(s)
Eric J. Cockayne
… zero- temperature np and lp configurations each have a hydrogen bond between the H of each framework hydroxyl group … are observed. A concentration x = 1.25 leads to hydrogen bonding between water molecules in the np phase that … MIL-53(Cr), MOF, hydrogen bonding, DFT, water adsorption …

Comparison of Numerical Approaches to the Time-Dependent Schrodinger Solutions in One Dimension

June 26, 2019
Author(s)
Heman Gharibnejad, Barry I. Schneider, Mark Leadingham, henry Schmale
… propagation schemes using a one-dimensional model of the hydrogen atom. In this model, the exact coulomb potential is … of what occurs in the fully three dimensional hydrogen atom. Our results show that while many numerically … Time Dependent Schrodinger Equation, one-dimensional hydrogen, numerical methods …

Multi-configuration Dirac-Hartree-Fock calculations of forbidden transitions within the 3d^k ground configurations of highly charged ions (Z = 72 - 83)

February 21, 2017
Author(s)
Z.L. Zhao, K. Wang, S. Li, R. Si, C.Y. Chen, J. Yan, Yuri Ralchenko
… 3p^6 3d^k(k = 1−9) ground configurations of highly charged ions (Z = 72−83). Complete and consistent data sets of level … Dirac-Hartree-Fock calculations, highly charged ions, magnetic dipole transitions, electric quadrupole … within the 3d^k ground configurations of highly charged ions (Z = 72 - 83) …

Effect of Hydrogen Concentration on Neutron Moderation of Hydrides at 900 K

September 5, 2025
Author(s)
Moiz Butt, Abdullah Weiss, Erik Pavlina, Thomas Nizolek, Michael Hahn, Caitlin Kohnert, Sean McDeavit, Erik Luther
… Yttrium, Zirconium, Hydride, Hydrogen, Moderation, Shielding, Attenuation, Permeation, … Effect of Hydrogen Concentration on Neutron Moderation of Hydrides at …

Resonant Soft X-Ray Photofragmentation of Propane

July 1, 2003
Author(s)
William E. Wallace, Daniel A. Fischer
… ions between 38 u and 40 u created by the loss of hydrogen while the electron-impact ionization is dominated by a major peak at 29 u corresponding to the two-carbon ion C 2 H 5 + . Within each envelope of three-, two-, or … spectrum showed a bias toward enhanced multiple hydrogen removal compared to the electron-stimulated spectrum. …

Simultaneous neutron and X-ray tomography for ex-situ 3D visualization of graphite anode degradation from extremely fast-charged lithium-ion batteries

November 16, 2022
Author(s)
Maha Yusuf, Jacob LaManna, Partha Paul, David Agyeman-Budu, Chuntian Cao, Alison Dunlop, Andrew Jansen, Bryant Polzin, Stephen Trask, Tanvir Tanim, Eric Dufek, Vivek Thampy, Hans-Georg Steinruck, Michael Toney, Johanna Weker
… Extreme fast charging (XFC) of commercial lithium-ion batteries (LIBs) in ≤10-15 minutes will significantly … X-ray imaging, tomography, extreme-fast charging, lithium-ion batteries … anode degradation from extremely fast-charged lithium-ion batteries …

Bevel Depth Profiling SIMS for Analysis of Layer Structures

September 1, 2003
Author(s)
John G. Gillen, Scott A. Wight, P Chi, Albert J. Fahey, Jennifer R. Verkouteren, Eric S. Windsor, D. B. Fenner
… are evaluating the use of bevel depth profiling Secondary Ion Mass Spectrometry (SIMS) for the characterization of … the analytical sample with an oxygen or cesium primary ion beam in a commercial SIMS instrument. The elemental … the resulting bevel surface is then imaged with a focused ion beam in the same instrument. This approach offers maximum …

Quantum Electrodynamics in the Dark

August 1, 2001
Author(s)
John D. Gillaspy
… dielectronic recombination, highly charged ions, ion traps, QED, quantum electrodynamics, strong electric …

Measuring Ion-Pairing in Buffer Solutions with Microwave Microfluidics

June 14, 2018
Author(s)
Angela C. Stelson, Charles A. Little, Nathan D. Orloff, Christian J. Long, James C. Booth
… such as electrical double layers (EDL), solvent-mediated ion interactions, and bound water molecules. However, … relaxations associated with the EDL, water molecules, and ion-pairing in solution. We compare the three-Debye … fit to a Cole-Cole/Debye model which does not include the ion-pairing relaxation, and find improved goodness of fit. …

Initial Etching of GaAs (001) During H 2 Plasma Cleaning

September 1, 2000
Author(s)
Steven W. Robey, K Sinniah
… steps. This effect is suggested top be associated with the hydrogen incorporation in the near-surface in the vicinity of … AFM, etch, GaAs, hydrogen, plasma …

Electron Self-Energy for the K and L Shells at Low Nuclear Charge

April 1, 2001
Author(s)
U Jentschura, Peter J. Mohr, G Soff
… electron self energy for the K- and L-shell states of hydrogen like ions with nuclear charge numbers Z = 1 to 5 is … 1/2 state has a numerical uncertainty of 0.8 Hz in atomic hydrogen, and for the L-shell states (2S 1/2 , 2P 1/2 and 2P …

Calculation of the Electron Self Energy for Low Nuclear Charge

January 1, 1999
Author(s)
U Jentschura, Peter J. Mohr, G Soff
… evaluation of the one-photon electron self-energy for hydrogen like ions with low nuclear charge numbers Z = 1 to … for 1S state has a numerical uncertainty of 0.8 Hz for hydrogen and 13 Hz for singly-ionized helium. Resummation and …
Displaying 801 - 825 of 3757
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