Surface physics

Question 1

How quick is ML produced in high vacuum?

Answer 1

3s

Question 2

How quick is ML produced in UHV?

Answer 2

8 hours

Question 3

Surface SPECIFIC vs Surface SENSITIVE?

Answer 3

Surface sensitive - surface effects can be measured
Surface specific - ONLY surface effects can be measured

Question 4

Differences in X-rays, neutrons and (electrons, ions)?

Answer 4

X-rays and neutrons are weakly interactive and penetrative. Not particularly good for surfaces

Electrons and ions – strongly interactive with matter – not penetrative – good probe for surfaces

Question 5

Applications of TF vs coating

Answer 5

TF:
Modern display technology
Magnetic data storage
Semiconductor devices
Metallic electrodes

Coating:
Hard coatings
Electrically conductive coatings
Architectural coatings
Optical coatings
Gas permeability battiers

Question 6

Gas vs Vapour

Answer 6

Gas:
Requires cooling to condense
T > critical temperature
Mostly exists on its own

Vapour:
Can be condensed by compression alone
T < critical temperature
Vapour coexists with the condensed phase

Question 7

Ideal gas law?

Answer 7

PV = NkT

P = nKT — n = N/V