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Transmission Electron Microscopy

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Development of a pulsed, variable-energy positron beam for atomic scale defect studies.

A C L Jones¹, R G Greaves², C L Codding³

¹Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43402, USA.

The Review of Scientific Instruments

|April 30, 2022

Summary

Positron annihilation spectroscopy now features a new magnetically guided, variable energy beam for detailed materials defect analysis. This advanced technique offers unprecedented depth-dependent characterization of solids, thin films, and irradiated materials.

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Area of Science:

Materials Science
Atomic Physics
Solid-State Physics

Background:

Positron annihilation spectroscopy (PAS) is a highly sensitive, non-destructive technique for material characterization.
PAS can detect single atom vacancies in solids with high sensitivity (10^-7).

Purpose of the Study:

To develop a magnetically guided, variable energy, pulsed positron beam for depth-dependent defect studies.
To establish the first such facility in the United States for advanced materials analysis.

Main Methods:

Development of a magnetically guided, variable energy, pulsed positron beam.
Design of a target stage for in situ annealing up to 800°C.
Implementation of a novel method to reduce background from backscattered positrons.

Main Results:

Successful development of a versatile positron beam for materials characterization.
The system allows for in situ annealing studies and background noise reduction.
The beam enables depth-dependent defect profiling in various materials.

Conclusions:

The new positron beam facility is a powerful tool for characterizing thin films, devices, and ion-irradiated materials.
This advancement significantly enhances the capabilities for defect analysis in the US.
The system provides sensitive, non-destructive insights into material properties at the atomic level.