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Search Publications

NIST Authors in Bold

Displaying 251 - 275 of 3755

MOTIS: A Focused Ion Beam Source Based On Laser-Cooled Atoms

November 10, 2011
Author(s)
Brenton J. Knuffman, Adam V. Steele, Jon Orloff, Mostafa Maazouz, Jabez J. McClelland
… MOTIS: A Focused Ion Beam Source Based On Laser-Cooled Atoms … Focused ion beam, ion microscopy, laser cooling. … MOTIS: A Focused Ion Beam Source Based On Laser-Cooled Atoms …

Techniques for microwave near-field quantum control of trapped ions

January 31, 2013
Author(s)
Ulrich J. Warring, C. Ospelkaus, Yves Colombe, Kenton R. Brown, Jason Amini, M Carsjens, Dietrich G. Leibfried, David J. Wineland
… spin and motional degrees of freedom of one and two 25Mg+ ions enabled two-ion entanglement. In this report, we extend … ion cooling, ion trapping, mechanical effects of light on ions, quantum computation architectures and implementations, … for microwave near-field quantum control of trapped ions …

In Situ Imaging of Highly Charged Ion Irradiated Mica

January 1, 2001
Author(s)
L P. Ratliff, John D. Gillaspy
… surfaces due to the impact of Xe44+ ions by imaging the ion-exposed surfaces with atomic force microscopy in vacuum. … AFM, highly charged ion, mica … In Situ Imaging of Highly Charged Ion Irradiated Mica …

Trapped Ions, Entanglement, and Quantum Computing

May 1, 1998
Author(s)
C J. Myatt, B E. King, D Kielpinski, Dietrich Leibfried, C S. 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 by reduced relative to the case of pure rf … a scheme to use this effect to differentially address the ions. …

A Microwave Study of Hydrogen-Transfer-Triggered Methyl-Group Rotation in 5-Methyltropolone

November 10, 2010
Author(s)
Vadim V. Ilyushin, Emily A. Cloessner, Yung-Ching Chou, Laura B. Picraux, Jon T. Hougen, Richard Lavrich
… as a 7-membered aromatic carbon ring with a five-membered hydrogen-bonded cyclic structure at the top and a methyl … exhibits two large-amplitude motions, an intramolecular hydrogen transfer and a methyl torsion. The former motion is particularly interesting because transfer of the hydrogen atom from the hydroxyl to the carbonyl group induces …

Extension of the Binary-Encounter-Dipole Model to Relativistic Incident Electrons

November 1, 2000
Author(s)
Yong Sik Kim
… electron energies. Total ionization cross sections for the hydrogen and helium atoms from the new relativistic formulas … original BED/BEB formulas is proposed for applications to ion targets and inner-shell electrons of neutral atoms and … atomic ion, helium, hydrogen, K-shell ionization, niobium, relativistic …

Studies of Ion Bombardment in High Density Plasmas Containing CF 4

July 1, 1999
Author(s)
James K. Olthoff, Yicheng Wang
… We report ion energy distributions, relative ion intensities, and absolute total ion current densities at the grounded electrode of an … plasmas, etching plasmas, inductively coupled plasmas, ion energy distributions, ion flux … Studies of Ion Bombardment in High Density Plasmas Containing CF 4 …

Identification of Active Sites of Biomolecules II: Saccharide and Transition Metal ion in Aqueous Solution

February 23, 2009
Author(s)
Orkid Coskuner, Denis E. Bergeron, Luis C. Rincon, Jeffrey W. Hudgens, Carlos A. Gonzalez
… dynamics (CPMD) simulations find that a single FeIII ion interacts with specific hydroxyl groups of the saccharide … in aqueous solution. Specifically, we find that one FeIII ion complexed to methyl-a-mannopyranoside also associates … ionization mass spectrometry measurements involving guided ion beam hydration measurements, which reveal an optimal …

Direct-write Lithiation of Silicon Using a Focused Ion Beam of Li+

July 8, 2019
Author(s)
William R. McGehee, Evgheni Strelcov, Vladimir P. Oleshko, Christopher L. Soles, Nikolai B. Zhitenev, Jabez J. McClelland
… processes that govern the performance of lithium ion batteries involve numerous parallel reactions and … of these systems. As a new way to study the behavior of ion transport and reaction in these applications, we report the use of a focused ion beam of Li+ to locally insert controlled quantities of …

Transport dynamics in a high-brightness magneto-optical-trap Li ion source

September 15, 2020
Author(s)
Jamie Gardner, William R. McGehee, Mark D. Stiles, Jabez J. McClelland
… methods for generating high brightness ions for focused ion beam applications. These sources produce ions by … results in a very low emittance, high-brightness ion beam. In a magneto- optical-trap-based ion source, the brightness is ultimately limited by the … MOTIS, cold atom ion source, MOT dynamics, magneto-optical trap, focused ion …

Reexamination of the C2H3+ microwave and infrared spectra

September 29, 2011
Author(s)
Jon T. Hougen, Laurent H. Coudert
… axis method (IAM) accounting for the large amplitude hydrogen migration motion. The line position analysis carried … by making several assumptions about the geometry of the ion along the tunneling path. The agreement between fitted … provides us with further insight into the nature of the hydrogen migration motion. In the present analysis, observed …

Noble-Metal-Free Ni-W-O-Derived Catalysts for High-Capacity Hydrogen Production from Hydrazine Monohydrate

April 13, 2020
Author(s)
Qing Shi, Deng-Xue Zhang, Hui Yin, Yu-Ping Qiu, Liang-Liang Zhou, Chen Chen, Hui Wu, Ping Wang
… render hydrazine monohydrate (N 2 H 4 .H 2 O) viable as a hydrogen carrier. Herein, we report a detailed study on … stability towards N 2 H 4 .H 2 O decomposition for hydrogen production. Significantly, this noble-metal-free catalyst enables rapid hydrogen production from commercially available N 2 H 4 .H 2 …

Surface Analysis Studies of Yield Enhancements in Secondary Ion Mass Spectrometry by Polyatomic Projectiles

May 1, 2001
Author(s)
E Fuoco, J Greg Gillen, M Wijesundara, William E. Wallace, L Hanley
… In this paper examine the mechanism of secondary ion yield enhancements previously observed for polyatomic … profilometry. Thus, the > 10x enhancement in secondary ion yield in secondary ion mass spectrometry observed for polyatomic ion projectiles … cluster bombardment, polyatomic ion bombardment, secondary ion mass spectrometry, sputter …

Effects of Al-Si Coating and Zn Coating on the Hydrogen Uptake and Embrittlement of Ultra-High Strength Press-Hardened Steel

September 25, 2019
Author(s)
Kyoung Rae Jo, Lawrence Cho, Dimas H. Sulistiyo, Eun Jung Seo, Seong Woo Kim, Bruno C. De Cooman
… automotive safety-related structure parts, is sensitive to hydrogen embrittlement due to its martensitic microstructure. Hydrogen is introduced in PHS during the hot press forming … by an atmospheric corrosion process. In this study, the hydrogen embrittlement behavior of uncoated, aluminized, and …

Direct Measurement of Hydrogen Diffusivity and Solubility Limits in Zircaloy 2 (Formula Unit of ZrH 0.0155 ) using Incoherent Quasi-Elastic Neutron Scattering

May 1, 2019
Author(s)
Brent J. Heuser, Timothy R Prisk, Jun-li Lin, Tanya J. Dax, Yongfeng Zhang
… The diffusivity of hydrogen is an important property of light water nuclear reactor (LWR) fuel cladding. LWR cladding absorbs hydrogen during normal operation, a contributing factor to … that decreases the lifetime of the fuel. Mass transport of hydrogen is dictated by an Arrhenius behavior typical of …

Bilayer crystals of trapped ions for quantum information processing

August 16, 2024
Author(s)
Samarth Hawalder, Prakriti Shahi, Allison Carter, Ana Rey Ayala, John J. Bollinger, Athreya Shankar
… remarkably clean bilayer crystals, wherein hundreds of ions self-organize into two well-defined layers. These … experiments with multilayer 3D crystals of trapped ions. … Bilayer crystals of trapped ions for quantum information processing …

Transition Energies of the D-lines in Na-like Ions

June 5, 2013
Author(s)
John D. Gillaspy, Dmitry D. Osin, Yuri Ralchenko, Joseph Reader, S A. Blundell
… the D1 (3s-3p1/2) and D2 (3s-3p3/2) transitions in Na-like ions of xenon, barium, samarium, gadolinium, dysprosium, … that we are aware of for QED in highly charged Na-like ions. It is also sensitive to retardation effects due to the … atomic spectroscopy, highly charged ions, quantum electrodynamics, electron beam ion trap …

Reversible Room-Temperature Fluoride-Ion Insertion in a Tunnel-Structured Transition Metal Oxide Host

July 6, 2020
Author(s)
Cherno Jaye, Wasif Zaheer, Justin L. Andrews, Forrest P. Hyler, Conan Weiland, David A. Shapiro, Jinghua Guo, Jesus M. Velazquez, Sarbajit Banerjee, Abhishek Parija, Daniel Fischer
… An energy storage paradigm orthogonal to conventional Li-ion battery chemistries can be conceptualized by employing anions as the primary charge carriers. F-ion conversion chemistries show promise but have limited … must further operate at elevated temperatures to achieve F-ion diffusion. In contrast, the exploration of intercalation …

Exposure of Self-Assembled Monolayers to Highly Charged Ions and Metastable Ions

July 1, 1999
Author(s)
L P. Ratliff, Ronaldo Minniti, A Bard, E W. Bell, John D. Gillaspy, D Parks, A J. Black, G M. Whitesides
… metastable argon atoms (Ar*) and highly charged xenon ions (HCIs) required to damage self-assembled monolayers … dose, highly charged ions, metastable ions, patterning, self-assembled monolayers, surface … Exposure of Self-Assembled Monolayers to Highly Charged Ions and Metastable Ions …
Displaying 251 - 275 of 3755
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