Electron Microscope System Components - Part 1 Flashcards
(27 cards)
What were early lenses called?
Magnifer or burning glasses
What did Claudis Ptolemy describe?
Who is credited for making the first eye glass?
Salino D’Armate
Who invented the first eyeglasses with dual lenses?
Roger Bacon
Who is know as the “First Scientist”?
Ibn al-Haytham
Who used Snell’s law to develp lens shapes that focus light with no geometric aberrations?
Ibn Sahl
Describe Snell’s Law:
Who created the first compound microscope?
Zacharias & Hans Jansen
Who is credited with the invention of the first telescope?
Hans Lippershey
What did Anton van Leeuwehoek do?
What did Robert Hooke do?
What did Marcello Malighi accomplish (Important)?
Working together Zeiss, Schott & Abbe produced what?
The first aberration corrected lenses
List some historical milestones in the development of the electron microscope?
Knoll & Ruska created the first?
Electron Microscope
What are the basic SEM Components?
How does the SEM work?
What does the electron gun do?
Generates stable beam of electrons of adjustable energy.
List the parts of an electron gun:
What does the Filament do?
What does the Wehnelt Cylinder/Grid Cap/ Shield do?
What does the Anode do?
List the three types of Filaments:
- Tungsten Hairpen
- Lanthanum Hexaboride
- Field Emission Electron Gun
What are the Filament Charateristics?
- Electron Current
- Brightness
- Lifetime
- Source Size
- Energy Spread
- Beam Stability
