GT MSE 2021 Exam 1 Fall 2024
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1
Energy of the Shell is dependent on...
n & l quantum numbers
2
l = 0
s
3
l = 1
p
4
l = 2
d
5
l = 3
f
6
m =
2l + 1
7
De Broglie Relation
Electron Wavelength is inversely proportional to its momentum
8
X-Ray Wavelength
~0.05 to 2.5 A
9
Light Wavelength
~2500 to 7000 A
10
Electron Penetration Depth
~0.001 mm
11
Planck's Theory
E = hv
12
Multiplicity vs Degeneracy
Multiplicity accounts for spins
13
Binding energy at the Fermi Level =
0
14
XPS detector measures...
core hole's electron's kinetic energy
15
Source energy in XPS & XES
X-Ray Photons
16
XPS source is kept constant? (T/F)
True
17
XES detector measures...
X-Rays Photos emitted from the sample
18
Source Energy in XAS is...
X-Ray
19
XAS Measurements are performed in...
Transmission
20
What does an Objective Lens do?
Brings the Image into focus for the eye/detector
21
OM magnifies up to...
~2000x
22
What's the benefit of EM in Transmission?
Provides Atomic Resolution
23
Radiation sample prep techniques:
Grinding, Freeze & Polish, Microtom, Other
24
Uranium microscopy:
XPS, XES, XAS
25
Polishing needs to be used for all methods except...
Fracture Surface Analysis
26
Electropolishing requires samples to be...
Conductive
27
How can we examine non-conductors in EM?
Coat them with gold or carbon
28
Polymer TEM Samples should use...
Microtomy
29
Snell's Law
sina1 / sina2 = v1 / v2 = n1 / n2
30
Abbe Equation
y = 0.612 (c / usina)
31
Numerical Aperature controls:
Resolution, Brightness, Working Distance
32
OM Contrast is...
the intensity difference between neighboring resolved image features
33
With OM, we can resolve images up to...
1 micron
34
As particle size decreases, the surface area per unit volume will...
increase
35
Field Emission Gun uses
Tungsten Single Crystal
36
LaB6 =
Lanthanum Hexaboride Single Crystal
37
Probe Current =
measured at the specimen
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