1.1 Microscopes And Microprobes

Question 1

What is Scanning Electron Microscope (SEM)?

Answer 1

Uses focused beam of high energy electrons
Generates signals at surface of solid specimen
Signals reveal information on texture, composition, structure, orientation
2 dimensional image generated from data
Analyses selected points on sample

Question 2

What are Electron Microprobes?

Answer 2

Uses electrons not light
View images at higher resolution
Wave length is longer than visible light
Electromagnetic coils not glass lenses - electrons can’t pass glass