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NIST Authors in Bold

Displaying 326 - 350 of 3840

Characteristics and Mechanisms of Hydrogen-Induced Quasi-Cleavage Fracture of Lath Martensitic Steel

January 10, 2021
Author(s)
Lawrence Cho, Peter E. Bradley, Damian S. Lauria, May L. Martin, Matthew J. Connolly, Jake Benzing, Eun Jung Seo, Kip O. Findley, John G. Speer, Andrew J. Slifka
… orientations, and dislocation characteristics beneath the hydrogen-induced quasi-cleavage features of an as-quenched, … (') 22MnB5 steel. The fracture surfaces of gaseous hydrogen-embrittled martensitic specimens were analyzed by a … diffraction (TKD). The dominant fracture mode in the hydrogen-affected zones was clearly quasi-cleavage fracture, …

Highly charged ion (HCI) modified tunnel junctions

August 15, 2008
Author(s)
Joshua M. Pomeroy, Holger Grube
… have characterized some basic principles of this unique ion-surface interaction, but recent activity reported here is … tunnel junction, highly charged ions, electron beam ion trap (EBIT) … Highly charged ion (HCI) modified tunnel junctions …

Detection of molecular hydrogen in a neutron beam lifetime experiment

December 12, 2025
Author(s)
Jimmy Caylor, Ripan Biswas, Bret Crawford, Maynard Dewey, Nadia Fomin, Geoffrey Greene, Shannon Hoogerheide, Jose Hungria-Negron, Hans Mumm, Jeffrey Nico, Daniel Valete, Fred Wietfeldt, Joseph Zuchegno
… lost, gained, or misidentified. The influence of molecular hydrogen interactions is of particular interest because of … performed on the production and detection of molecular hydrogen in an apparatus used to measure the neutron … We demonstrate that charge exchange with molecular hydrogen can occur with trapped protons, and we determine the …

Benchmark Gauging System for a Small-Scale Liquid Hydrogen Tank

October 12, 2021
Author(s)
N T. Van Dresar, James D. Siegwarth
… weigh the fluid contents of a small-scale liquid hydrogen test tank has been experimentally verified. It is … calibration, liquid hydrogen, scale, vacuum, waste system … Benchmark Gauging System for a Small-Scale Liquid Hydrogen Tank …

Collisional-Radiative Modeling for Highly-Charged Ions of Tungsten

April 23, 2013
Author(s)
Yuri Ralchenko
… in collisional-radiative modeling of highly-charged ions of tungsten that are relevant to fusion research. The status of spectroscopic data for W ions is briefly discussed as well. Strategies and … spectra, collisional-radiative modeling, highly-charged ions … Collisional-Radiative Modeling for Highly-Charged Ions of Tungsten …

Fabrication of Specimens for Atom Probe Tomography using a Combined Gallium and Neon Focused Ion Beam Milling Approach

August 16, 2023
Author(s)
Frances Allen, Paul Blanchard, David Pappas, Russell Lake, Deying Xia, John Notte, Ruopeng Zhang, Andrew Minor, Norman A. Sanford
… We demonstrate a new focused ion beam sample preparation method for atom probe tomography. … The key aspect of the new method is that we use a neon ion beam for the final tip shaping after conventional annulus milling using gallium ions. This dual-ion approach combines the benefits of the faster milling …

Nanoscale Focused Ion Beam from Laser-cooled Lithium Atoms

October 26, 2011
Author(s)
Brenton J. Knuffman, Adam V. Steele, Jon Orloff, Jabez J. McClelland
… To advance the capabilities of focused ion beam (FIB) technology, we have created a low-energy FIB … in a magneto-optical trap (MOT). This magneto-optical trap ion source relies on both the low temperature of the … energy spread of the resultant beam to form a nanoscale ion probe at its focus. We present examples of microscopy …

How Well Do DFT and MP2 Treat Intramolecular Hydrogen Bonding in Protonated Amino Acids?

October 16, 2008
Author(s)
John K. Merle, Karl K. Irikura
… coupled-cluster methods to resolve a discrepancy involving hydrogen-bonding interactions at different theoretical … glycine [GlyH+(O)] is predicted to have a stable N H O hydrogen-bonded intermediate, the MP2 and B3LYP methods … methods above the MP2 level to describe intramolecular hydrogen bonding structures. …

Spot Test Kits for Detecting Lead in Household Paint: A Laboratory Evaluation

May 1, 2000
Author(s)
Walter J. Rossiter Jr, M Vangel, M E. McKnight, G Dewalt
… study, four test kits were based on the reaction of lead ion with sulfide ion to produce a gray or black color, … either a white lead (i.e., basic lead carbonate) or a lead chromate pigment, had ten lead levels ranging from 0 mg/cm 2 … as a negative screen for lead-based paint. For lead chromate specimens, three of these six kits two sulfide-based …

Construction of Highly Porous and Robust Hydrogen-Bonded Organic Framework for High-Capacity Clean Energy Gas Storage

August 13, 2024
Author(s)
Jia-Xin Wang, Xu Zhang, Changhao Jiang, Teng-Fei Zhang, Jiyan Pei, Wei Zhou, Taner N. Yildirim, Banglin Chen, Guodong Qian, Bin Li
… Development of highly porous and robust hydrogen-bonded organic frameworks (HOFs) for high-pressure methane and hydrogen storage remains a grand challenge due to the fragile nature of hydrogen bonds. Herein, we report a strategy of constructing … Porous Material, Hydrogen Storage, Methane Storage …

Highly Charged Ions in Rare Earth Permanent Magnet Penning Traps

July 13, 2012
Author(s)
Nicholas D. Guise, Samuel Brewer, Joseph Tan
… the isolation, manipulation, and study of highly charged ions. Highly charged ions are produced in the NIST electron-beam ion trap (EBIT), … NdFeB permanent magnets integrated into its electrodes. Ions of charge Qe, emerging from the EBIT with energy up to … Highly Charged Ions in Rare Earth Permanent Magnet Penning Traps …

EUV spectra of Rb-like to Cu-like gadolinium ions in an electron beam ion trap

October 8, 2012
Author(s)
Yuri Ralchenko, Deirdre Kilbane, G. O'Sullivan, John D. Gillaspy, Joseph Reader
… ultraviolet radiation from highly-charged gadolinium ions were made at the National Institute of Standards and Technology. The ions were produced and confined in an electron beam ion trap (EBIT) and the spectra were recorded with a … Gadolinium, highly-charged-ions, extreme-ultraviolet spectra, collisional-radiative …

Dispersion and Burning Behavior of Hydrogen Released in a Full-Scale Residential Garage in the Presence and Absence of Conventional Automobiles - Supplemental Video Materials

July 11, 2018
Author(s)
William M. Pitts, Jiann C. Yang, Kuldeep Prasad, Marco G. Fernandez
… (HD), high-speed, and infrared videos of 13 full-scale hydrogen dispersion and burning experiments in a full-scale … fire safety, fuel-cell, garage, hydrogen … Dispersion and Burning Behavior of Hydrogen Released in a Full-Scale Residential Garage in the …

Reference Gauging System for a Small-Scale Liquid Hydrogen Tank

October 12, 2021
Author(s)
N T. Van Dresar, James D. Siegwarth
… weigh the fluid contents of a small-scale liquid hydrogen test tank has been experimentally verified. It is … calibration vacuum, cryogenic, hydrogen, weigh tank … Reference Gauging System for a Small-Scale Liquid Hydrogen Tank …

Identifications of extreme ultraviolet spectra of Br-like to Ni-like neodymium ions using an electronbeam ion trap

April 30, 2021
Author(s)
C. Suzuki, Dipti Goyal, Y. Yang, A. Gall, Roshani Silwal, S. Sanders, Aung S. Naing, Joseph N. Tan, Endre A. Takacs, Yuri Ralchenko
… extreme ultraviolet spectra of open N-shell neodymium (Nd) ions have been recorded in an electron beam ion trap facility at the National Institute of Standards and … code. Consequently, 59 lines from Br-like to Ni-like Nd ions have been unambiguously identi ed, most of which are …

Monitoring Ion Current and Ion Energy During Plasma Processing Using Radio-Frequency Current and Voltage Measurements

February 1, 2001
Author(s)
Mark A. Sobolewski
… common diagnostic techniques can be used to measure ion current and ion energy, these techniques areusually not compatible with … by industry. Methods have been proposed for determining ion properties from the applied rf current and voltage, which … current, electrical measurements, energy, flux, ion, plasma processing, process monitoring, radio-frequency …

Reversible Proton Transfer Dynamics in Bacteriorhodopsin

August 20, 2004
Author(s)
Y. S. Lee, Morris Krauss
… the nearest water initiates the organization of a strongly hydrogen bonded ionic water chain conducive to the transfer … to proton transfer larger than kT within the close-coupled hydrogen bond network. The fifth water that branches from the four water chain is also hydrogen bonded to back-bone carbonyls. The binding of this …

Simulating Quantum Magnetism with Correlated Non-Neutral Ion Plasmas

August 27, 2012
Author(s)
John J. Bollinger, Joseph W. Britton, Brian C. Sawyer
… depend on the internal atomic state (or spin) of an atomic ion, the Coulomb potential energy of a strongly coupled array … effective spin interactions are engineered with trapped ion crystals. We summarize the type of effective spin … discuss an experimental implementation using single- plane ion crystals in a Penning trap. …

Cascade Transition X-Rays From Electron Capture Into Highly Charged Ions in Collisions With Neutral Gas Targets

May 1, 2003
Author(s)
H Tawara, E Takacs, L P. Ratliff, John D. Gillaspy, K Tokesi
… have been observed from low energy, highly charged Kr 1+ ions (q=27-36) colliding with neutral Ar atoms. The intensity … formed during cascades after electron capture into Kr 27+ ions. This is also supported by time-dependent population … charge exchange, highly charged ions, ion-atom collisions, x-rays …

Spectroscopic analysis of N-intrashell transitions in Rb-like to Ni-like Yb ions

June 9, 2020
Author(s)
Dipti Goyal, R. Silwal, Joan M. Dreiling, Samuel C. Sanders, Endre A. Takacs, Yuri Ralchenko
… Extreme ultraviolet spectra of highly-charged ytterbium ions produced in an electron beam ion trap at National … were identi ed in Rb-like Yb33+ through Ni-like Yb42+ ions. The e ects of strong con guration interaction within … Spectroscopy, electron beam ion trap, highly-charged ions, ytterbium, collisional-radiative modeling …

Trapped Ions, Entanglement, and Quantum Computing, ed. by B.L. Fearey

January 1, 1998
Author(s)
C J. Myatt, B E. King, D Kielpinski, Dietrich Leibfried, Q A. Turchette, Chris S. Wood, Wayne M. Itano, C Monroe, David J. Wineland
… range of 5-20 MHz. The equilibrium positions of pairs of ions that are crystallized in this trap lie along the long … potential to the trap, the micromotion of two crystallized ions may be reduced relative to the case of pure rf … a scheme to use this effect to differentially address the ions. …

Experimental Characterization of the Advanced Liquid Hydrogen Cold Neutron Source Spectrum of the NBSR Reactor at the NIST Center for Neutron Research

August 1, 2015
Author(s)
Jeremy C. Cook, John G. Barker, J. Michael Rowe, Robert E. Williams, Cedric V. Gagnon, Richard M. Lindstrom, Richard Michael Ibberson, Dan A. Neumann
… experimental characterization of the Advanced Liquid Hydrogen Cold Neutron Source brightness to date. Measurements … at reactor startup. Prior to the latter measurement the hydrogen was maintained in a liquefied state for an extended … attempt to observe the anticipated growth of the ortho (0)-hydrogen concentration following startup. Since papra …
Displaying 326 - 350 of 3840
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