Ion Scattering Spectroscopy (ISS)

Сентябрь 4, 2022

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Ion Scattering Spectroscopy (ISS)

Содержание

2. What is Ion Scattering Spectroscopy? Ion scattering spectroscopy (ISS), is a surface-sensitive analytical technique used to
3. Technique Ions are directed onto a sample and the energy of the backscattered projectiles is determined.
4. General experimental setup for LEIS.
5. Diagram of an electrostatic analyzer in the hemispherical geometry Only ions of a selected energy pass
6. Experimental geometry for ion scattering spectroscopy
7. Calculations The equation below shows how the energy of a scattered ion peak is related to
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What is Ion Scattering Spectroscopy?
Ion scattering spectroscopy (ISS), is a surface-sensitive

analytical technique used to characterize the chemical and structural makeup of materials.
Ion scattering spectroscopy often refers to the use of low (LEIS) energy ions in the range of 0.5 to 10 keV.
Low-energy ion scattering spectroscopy (LEIS),

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Technique
Ions are directed onto a sample and the energy of the

backscattered projectiles is determined.
The ionized particles are single atoms usually in a single positive charge state.
LEIS typically uses a scattering angle around 135°

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General experimental setup for LEIS.

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Diagram of an electrostatic analyzer in the hemispherical geometry
Only ions of

a selected energy pass through to the detector.
Using electrostatic deflectors to direct only ions of a particular energy range into a collector, while all other ions are redirected.

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Experimental geometry for ion scattering spectroscopy

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Calculations
The equation below shows how the energy of a scattered ion

peak is related to the other relevant factors.
ES = Kinetic energy of the scattered ion M1 = Relative atomic mass of the scattered ion E0 = Kinetic energy of the primary ion beam M2 = Relative atomic mass of the scattering surface atom θ = Scattering angle