frank laboratory of neutron physics ion beam analysis stanciu-oprean ligia supervisor dr. kobzev...
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FRANK LABORATORY OF NEUTRON FRANK LABORATORY OF NEUTRON PHYSICSPHYSICS
ION BEAM ANALYSISION BEAM ANALYSIS
STANCIU-OPREAN LIGIASTANCIU-OPREAN LIGIA
SUPERVISOR DR. KOBZEV ALEXANDERSUPERVISOR DR. KOBZEV ALEXANDER
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MAIN PROPERTIES OF VAN DE GRAAF MAIN PROPERTIES OF VAN DE GRAAF ACCELERATORACCELERATOR
Accelerated ions 1H+, 2H+, 3He+, 4He+,12C+, 14N+, 16O+
Energy range 0.7 – 3.5 MeV
Energy spread ` < 500 eV
Accuracy in energy 1 keV
Beam intensities H – 30 A He – 10 A C, N, O ~ 1 A
Beam lines 6
Height of the accelerating tube 6 m
Diameter of the tank 2.5 m
Pressure in the tank 8 at
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Rutherford Backscattering Spectrometry
2
12
122
122 ]
cos)sin([
21
MM
MMMk
M1 –mass of incident particleM1 –mass of incident particle
М2 –М2 –mass of scattering atommass of scattering atom;;
--scattering anglescattering angle
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Backscattering crossectionBackscattering crossection
221
22
2221
221
2
2
0
221
sin
]sincos[
2sin
1)
2(
MM
MMM
E
ezz
d
d
Z1 – the atomic number of incident particles;
Z2 – the atomic number of scattered atom;е – the electronic charge;
E0 – the energy of the projectile immediately before scattering
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RBS SPECTRUM FOR W/La/Si – SAMPLERBS SPECTRUM FOR W/La/Si – SAMPLE
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PIXE MethodPIXE Method
• Moseley lawMoseley law
frequency of X-rayfrequency of X-ray;;Rc –Rydberg’s constantRc –Rydberg’s constant;;
ZZ – –atomic numberatomic number;;SnSn – – screening constant screening constant;;nn – –main quantum numbermain quantum number;;
n
SZ
Rn
c
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PIXE SPECTRUM FOR ENVIRONMENT SAMPLE
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RBS PIXE
C 34
N 28
О 19
F 3.4
Na 5.1
Mg 1.8
Al 3.3
Si 3.5
S 0.02
K 0.2
Ca 1.2
Mn 0.015
Fe 0.40
Cu 0.003
Zn 0.01
As 0.001
Zr 0.003
Ba 0.02
Sample N1
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Conclusion
1.RBS and PIXE are undamaging methods.
2. Any element with mass from 1 up to 200 can be
identified exactly.
3. The depth resolution reaches 2-3 nm.
4. The actual accessible depth for analysis is near 2-3 mkm
for He-beam and is 10-15 mkm for proton beam.
5.The sensitivity is different for the various samples, but for
heavy elements it can be less, than 0.1 atomic %.