TEM

Question 0

Beam passes through sample, three things can happen to electrons…..

Answer 0

1- can be inelastically scattered - lose energy

2- can be transmitted and unscattered

3- can be elastically scattered - lose no energy

Question 1

The electron beam transmitted through the sample is…..

Answer 1

A single beam - The incident beam

Question 2

5 key usages……

Answer 2

Geological samples
Biological samples
Biomedical samples
Identify chemical comp of inorganic pigments in paint
Identify structural and texture characteristics and composition of a sample

Question 3

Resolution is ……… Than SEM

Answer 3

Higher

Question 4

Thick samples may prevent transmission, the optimal sample size is…… To allow the beam to pass through

Answer 4

100 - 200 nm thick

Question 5

Electrons are passed through sample and scattered according to…….

This the the …….

Answer 5

The spacing of the samples atoms

The diffraction pattern

Question 6

Sample prep is more/less complex than SEM

Answer 6

More complex

Question 7

Thinning of sample is done by…..

Answer 7

Ion milling - Argon is fired at sample.