MyScope
training for advanced research
Search
Glossary terms about Electron beam
- Electron beam
- A stream of electrons (cathode rays).
▼1 more term contains Electron beam
21 pages mention Electron beam
- Additional material
- H. electron beam analysis of materials (2nd ed.
- Background information - What is transmission electron microscopy?
- the electron beam) within a high vacuum, and detecting the electrons that are transmitted through the sample.
- Chromatic aberration
- While ΔE in the incident electron beam is < 1 eV.
- Combining images
- The reason only one crystal or region is seen in each dark field image is because the electron beam is lined up on a discrete intensity spot in the diffraction pattern, hence only electrons diffracted by that lattice arrangement are being imaged.
- Concepts - introduction
- The fundamental basis of electron microscopy is the use of an electron beam.
- Diffraction basics
- This is because a crystal lattice acts as a diffraction grating: interference patterns are produced in the electron beam as it travels out from the lattice and these can be projected as an image of regular dots or rings.
- Diffraction patterns
- When the electron beam interacts with the sample when the sample is oriented with a zone axis pattern parallel to the electron beam, then the diffraction pattern form in the back focal plane of the objective lens is a regular array of reflections.
- Electron column
- Electron gun
- The electron gun generates the electron beam.
- Frequently asked questions
- How is a specimen loaded and inserted?
- Image formation basics
- The TEM images are formed in two stages: Stage A is the scattering of an incident electron beam by a specimen.
- Image types
- In the bright field image the objective aperture is used to select the unscattered electron beam.
- Imaging mode setup
- Inorganic sample/physical science specimen preparation for TEM
- Lenses: electromagnetic lenses
- The electron beam travels through the central hole.
- Magnetic lens system
- Within the column the electromagnetic lenses shape the electron beam, which travels in a spiral trajectory.
- Object/Image planes
- Resolution
- The diffracted beam
- When the electron beam passes through the thin crystalline sample, it is diffracted by the atomic planes in the sample when the Bragg condition is satisfied.
- Tilting
- The appearance of a diffraction pattern will depend on the orientation of the specimen to the electron beam.
- What the TEM can't do
- Na+) are volatile under the electron beam because the negative electron beam exerts a force on charged material.