additional info

Question 1

what is resolution dependent on?

Answer 1

all components of the spot size/ airy disk diameter (d)
wavelength, focal length, lens diameter

Question 2

techniques used for surface properties

Answer 2

microscopy eg SEM an TEM

Question 3

techniques used for bulk properties

Answer 3

diffraction eg XRD

Question 4

what can X ray diffraction determine

Answer 4

• lattice parameters
• crystal structure
• crystallite size
• phase composition of the sample - gives compositional info

Question 5

why use raman?

Answer 5

material identification
sample matching and heterogeneity
structure determination
forgery detection
foreign substances in fingerprints

Question 6

what is refractive index

Answer 6

a measure of the change in the speed of light as it passes from vacuum to a material

Question 7

BSE

Answer 7

• originates from probing beam and deflected in the sample
• higher energy
• gives sample homogeneity

Question 8

SE

Answer 8

• an electron from material is dislodged by the interaction with probing beam
• lower energy
• emitted from coating of the specimen - gives topography

Question 9

peak on an XRD that indicates glass

Answer 9

broad peak on left hand side