Where do photons go When they come out of the beamline and hit my crystal.
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Where do photons go When they come out of the beamline and hit my crystal
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Transcript of Where do photons go When they come out of the beamline and hit my crystal.
Where do photons go
When they come out of the beamline and hit my crystal
Elastic scattering
Elastic scattering
Inelastic scattering
Photonuclear absorption
Photonuclear absorption
Photoelectric absorption
Photoelectric absorptione-
+
Fluorescence
+
Fluorescence
e-
+
Photoelectric absorption
Photoelectric absorptione-
+
Secondary ionization
e-
Secondary ionization
e-
e-
+
Secondary ionization
Secondary ionization
Secondary ionization
e-
+
Secondary ionization
e-
e-
e-
e-
e-
e-
+
Secondary ionization
e-
e-
e-
e-
e-
e-
e-
e-
e-
+
+
+
+
+
+
+
++
Secondary ionization
e-
e-
e-
e-
e-
e-
+
+
+
+
+
+
+
+
e-
e-
+
e-
Secondary ionization
e-
e-
e-
e-
e-
e-
+
+
+
+
+
+
+
++
Where do photons go?
beamstop
Transmitted (98%)
Protein1A x-rays
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (98%)
Protein1A x-rays
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (98%)
inelastic scattering (7%)
Protein1A x-rays
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (98%)
inelastic scattering (7%)
Protein1A x-rays
Re-emitted (99%) Absorbed (~0%)
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (98%)
inelastic scattering (7%) Photoelectric (87%)
Protein1A x-rays
Re-emitted (99%) Absorbed (~0%)
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (98%)
inelastic scattering (7%) Photoelectric (87%)
Protein1A x-rays
Re-emitted (~0%) Absorbed (99%)Re-emitted (99%) Absorbed (~0%)
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (98%)
useful/absorbed energy: 7.3%
inelastic scattering (7%) Photoelectric (87%)
Protein1A x-rays
Re-emitted (~0%) Absorbed (99%)Re-emitted (99%) Absorbed (~0%)
Where do photons go?
beamstop
elastic scattering (6%)
Transmitted (97%)
useful/absorbed energy: 7.6%
inelastic scattering (5%) Photoelectric (88%)
SelenoProtein1A x-rays
Re-emitted (~0%) Absorbed (99%)Re-emitted (99%) Absorbed (~0%)
Where do photons go?
beamstop
elastic scattering (2%)
Transmitted (91%)
useful/absorbed energy: 5.1%
inelastic scattering (2%) Photoelectric (96%)
SelenoProtein0.92A x-rays
Re-emitted (57%) Absorbed (44%)Re-emitted (99%) Absorbed (~0%)
just above the edge
Where do photons go?
beamstop
elastic scattering (2%)
Transmitted (90%)
useful/absorbed energy: 5.1%
inelastic scattering (2%) Photoelectric (96%)
SelenoProtein0.97A x-rays
Re-emitted (60%) Absorbed (40%)Re-emitted (99%) Absorbed (~0%)
far above the edge
Background scattering
Resolution (Ǻ)
Ele
ctro
n e
qu
ival
ents
The form-factor of the cryostream
20 10 5 4 3 2.5 2 1.8 1.6 1.4 1.2 1
0
2
4
6
8
10
12
14
1
6
measured
theoretical
Background scattering
0
50
100
150
200
250
300
0.00 0.07 0.13 0.20 0.27 0.33 0.40 0.47
35mm air
200um water
everything else
Resolution (Ǻ)
Ph
oto
ns/
s/p
ixel
Se edge with detector at 100 mm
7.5 3.8 2.5 1.9 1.5 1.2 1.1
