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Related Concept Videos

Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Volatilization01:10

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...

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Updated: May 8, 2026

Atom Probe Tomography Analysis of Exsolved Mineral Phases
08:14

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

Level set methods for modelling field evaporation in atom probe.

Daniel Haley1, Michael P Moody, George D W Smith

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|August 30, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces continuum numerical approximations to model atom probe field evaporation, aiming to reduce geometric distortions and improve spatial accuracy in 3D material reconstructions.

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Last Updated: May 8, 2026

Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries
09:51

Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries

Published on: April 22, 2013

Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Physics

Background:

  • Atom probe tomography provides high-resolution 3D chemical and spatial data for materials.
  • Geometric distortions in atom probe data arise from uncertainties in ion projection, limiting spatial accuracy.
  • Understanding evaporative physics is crucial for accurate atom probe reconstructions.

Purpose of the Study:

  • To explore continuum numerical approximations for modeling evaporative behavior in atom probe experiments.
  • To investigate the propagation of ions from the specimen to the detector.
  • To address geometric distortions in atom probe datasets, particularly for axisymmetric systems.

Main Methods:

  • Developing continuum numerical approximations for field evaporation.
  • Solving axisymmetric systems to simulate ion trajectories.
  • Analyzing the propagation of ions to the detector.

Main Results:

  • The proposed numerical method offers a way to approximate evaporative behavior.
  • It addresses the propagation of ions and potential geometric distortions.
  • Focus on axisymmetric systems like isolated particles and multilayers.

Conclusions:

  • Continuum numerical approximations show promise for modeling atom probe experiments.
  • This approach can help mitigate geometric distortions and enhance spatial accuracy.
  • The method is critical for rapid modeling of tip shape evolution in atom probe tomography, leading to faster, more accurate reconstructions.