scholarly journals The distribution of O and N in the surface region of laser-patterned titanium revealed by atom probe tomography

2021 ◽  
pp. 150193
Author(s):  
D. Kuczyńska-Zemła ◽  
G. Sundell ◽  
M. Zemła ◽  
M. Andersson ◽  
H. Garbacz
Keyword(s):  
Atom Probe Tomography ◽  
Surface Region ◽  
Atom Probe

scholarly journals Chemical Composition of High-T\(_{C} \text{ Ge}_{1 - x}\text{Mn}_{x}\) Nanocolumns Grown on \(\text{Ge}(001)\) Substrates

2014 ◽  
Vol 24 (2) ◽  
pp. 163
Author(s):  
Le Thi Giang ◽  
Nguyen Manh An
Keyword(s):  
Chemical Composition ◽  
Atom Probe Tomography ◽  
Molecular Beam ◽  
Surface Region ◽  
Atom Probe ◽  
High Energy ◽  
Atomic Scale ◽  
High Energy Electron ◽  
The Matrix ◽  
Mn Concentration

By mean of molecular beam epitaxy (MBE) equipped with a reflexion high-energy electron diffraction (RHEED) technique, we have chosen an intermediate and appropriate substrate temperature of 130\(\r{}\)C to reproducibly synthetize high-T\(_{C}\) Ge\(_{1 - x}\)Mn\(_{x}\) nanocolumns phase. Laser Pulse Atom Probe Tomography (LP-APT) technique have been used to determine at atomic scale the chemical composition inside nanocolumns and also in the surrounding diluted matrix. The Mn concentration inside nanocolumns is found to be highly inhomogeneous, it is about 20\({\%}\) at the bottom and can increase up to \(\sim 40{\%}\) in the top near the surface region. The Mn concentration in the matrix is about 0.25\({\%}\) at the surface and can reach a highest value of $\sim $1{\%} in regions close to the interface.

Understanding the Effects of Graphene Coating on the Electrostatic Field at the Tip of an Atom Probe Tomography Specimen

2021 ◽  
pp. 1-12
Author(s):  
Florant Exertier ◽  
Jiangting Wang ◽  
Jing Fu ◽  
Ross K.W. Marceau
Keyword(s):  
Electrostatic Field ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Graphene Coating

Abstract

scholarly journals Correlating nanoscale secondary ion mass spectrometry and atom probe tomography analysis of uranium enrichment in metallic nuclear fuel

The Analyst ◽  
2021 ◽  
Vol 146 (1) ◽  
pp. 69-74
Author(s):  
Elizabeth Kautz ◽  
John Cliff ◽  
Timothy Lach ◽  
Dallas Reilly ◽  
Arun Devaraj
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Fuel ◽  
Atom Probe Tomography ◽  
Secondary Ion Mass Spectrometry ◽  
Atom Probe ◽  
Uranium Enrichment ◽  
Length Scales ◽  
Atom Probe Tomography Analysis ◽  
Secondary Ion ◽  
Tomography Analysis

235U enrichment in a metallic nuclear fuel was measured via NanoSIMS and APT, allowing for a direct comparison of enrichment across length scales and resolutions.

scholarly journals Inside Front Cover: Atom Probe Tomography of Encapsulated Hydroxyapatite Nanoparticles (Small Methods 2/2021)

Small Methods ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 2170004
Author(s):  
Daniel S. Mosiman ◽  
Yi‐Sheng Chen ◽  
Limei Yang ◽  
Brian Hawkett ◽  
Simon P. Ringer ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Hydroxyapatite Nanoparticles ◽  
Front Cover

scholarly journals 3D sub-nanometer analysis of glucose in an aqueous solution by cryo-atom probe tomography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
T. M. Schwarz ◽  
C. A. Dietrich ◽  
J. Ott ◽  
E. M. Weikum ◽  
R. Lawitzki ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Density Functional ◽  
Chemical Characterization ◽  
Analytical Techniques ◽  
Atom Probe ◽  
Characterization Methods ◽  
Signal Deconvolution ◽  
The Stability ◽  
Frozen Solutions ◽  
3D Volume

AbstractAtom Probe Tomography (APT) is currently a well-established technique to analyse the composition of solid materials including metals, semiconductors and ceramics with up to near-atomic resolution. Using an aqueous glucose solution, we now extended the technique to frozen solutions. While the mass signals of the common glucose fragments CxHy and CxOyHz overlap with (H2O)nH from water, we achieved stoichiometrically correct values via signal deconvolution. Density functional theory (DFT) calculations were performed to investigate the stability of the detected pyranose fragments. This paper demonstrates APT’s capabilities to achieve sub-nanometre resolution in tracing whole glucose molecules in a frozen solution by using cryogenic workflows. We use a solution of defined concentration to investigate the chemical resolution capabilities as a step toward the measurement of biological molecules. Due to the evaporation of nearly intact glucose molecules, their position within the measured 3D volume of the solution can be determined with sub-nanometre resolution. Our analyses take analytical techniques to a new level, since chemical characterization methods for cryogenically-frozen solutions or biological materials are limited.

A multi-ion plasma FIB study: Determining ion implantation depths of Xe, N, O and Ar in tungsten via atom probe tomography

2021 ◽  
pp. 113334
Author(s):  
Katja Eder ◽  
Vijay Bhatia ◽  
Jiangtao Qu ◽  
Brandon Van Leer ◽  
Mikhail Dutka ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Ion Plasma

scholarly journals Developing Atom Probe Tomography of Phyllosilicates in Preparation for Extra‐Terrestrial Sample Return

2021 ◽  
Author(s):  
Luke Daly ◽  
Martin R. Lee ◽  
James R. Darling ◽  
Ingrid McCarrol ◽  
Limei Yang ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Sample Return

scholarly journals 3D Nanoscale Analysis of Protein-Mineral Nanoparticle Interfaces Using Atom Probe Tomography for Understanding Amelogenesis

2021 ◽  
Vol 27 (S1) ◽  
pp. 1268-1269
Author(s):  
Sandra Taylor ◽  
Arun Devaraj ◽  
Yongsoon Shin ◽  
Jinhui Tao ◽  
Garry Buchko ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe

scholarly journals An integrated approach to understanding RF vacuum arcs

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
J. Norem ◽  
Z. Insepov ◽  
A. Hassanein
Keyword(s):  
Magnetic Fields ◽  
Failure Analysis ◽  
Field Dependence ◽  
Atom Probe Tomography ◽  
General Model ◽  
Surface Damage ◽  
Integrated Approach ◽  
Atom Probe ◽  
Vacuum Arc ◽  
Stage Model

AbstractAlthough used in the design and costing of large projects such as linear colliders and fusion tokamaks, the theory of vacuum arcs and gradient limits is not well understood. Almost 120 years after the isolation of vacuum arcs, the exact mechanisms of the arcs and the damage they produce are still being debated. We describe our simple and general model of the vacuum arc that can incorporate all active mechanisms and aims to explain all relevant data. Our four stage model, is based on experiments done at 805 MHz with a variety of cavity geometries, magnetic fields, and experimental techniques as well as data from Atom Probe Tomography and failure analysis of microelectronics. The model considers the trigger, plasma formation, plasma evolution and surface damage phases of the RF arc. This paper also examines how known mechanisms can explain the observed sharp field dependence, fast breakdown times and observed surface damage. We update the model and discuss new features while also pointing out where new data would be useful in extending the model to a wider range of frequencies.

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