additional info Flashcards
1
Q
what is resolution dependent on?
A
all components of the spot size/ airy disk diameter (d)
wavelength, focal length, lens diameter
2
Q
techniques used for surface properties
A
microscopy eg SEM an TEM
3
Q
techniques used for bulk properties
A
diffraction eg XRD
4
Q
what can X ray diffraction determine
A
- lattice parameters
- crystal structure
- crystallite size
- phase composition of the sample - gives compositional info
5
Q
why use raman?
A
material identification
sample matching and heterogeneity
structure determination
forgery detection
foreign substances in fingerprints
6
Q
what is refractive index
A
a measure of the change in the speed of light as it passes from vacuum to a material
7
Q
BSE
A
- originates from probing beam and deflected in the sample
- higher energy
- gives sample homogeneity
8
Q
SE
A
- an electron from material is dislodged by the interaction with probing beam
- lower energy
- emitted from coating of the specimen - gives topography
9
Q
peak on an XRD that indicates glass
A
broad peak on left hand side
