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- Rutherford Backscattering Spectrometry (RBS).
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Embeds 0 No embeds. No notes for slide. It represents a bridge between Classical Physics and Modern Physics. Most of the modern techniques of analysis are based on quantum mechanics since matter is studied in terms of interactions of its microscopic components. But for their strong orientation to do measurements they are often interpreted according to semi classical models. It supplies an exciting context of application of Classical Physics The application of classical interpretation models allows to obtain microscopic information such thicknesses and composition of thin films.
It contributes to learn a physical view of the world New physical quantities founded on very general principles of Physics are introduced, irrespective to the Classical or the Modern Physics context. It supplies a methodological view to investigate the microscopic world It is a modern and very diffused technique extensively used by scientists as research tool in material science It can become object of secondary school student study Experiments and activities that students operatively perform can be designed and proposed for secondary school labs.
What is Rutherford Backscattering Spectrometry? RBS provides information about mass and depth distribution of the constituent elements of the first hundreds of nanometers of the surface of a sample nm SiO 2 nm Si Si substrate 5. It exploits the phenomenon of collision between a mono-energetic ion beam with the atoms of the target 6.
Rutherford Backscattering Spectrometry
The measurement consists in the collection of the energy spectrum of the ions of the beam which, after a collision with the atoms of the target, are backscattered along a certain direction 8. Ion elastic collision with a target atom kinematic factor What is the energy of an ion after an elastic collision with a heavier nucleus? Or else, conversely, how can the mass of a target element be evaluated from a measure of the energy of the backscatterd ions?
The Kinematic factor sample ion beam detector ion beam Mercier 1 , P.
Rutherford Backscattering Spectrometry (RBS) Services
Trocellier 2 , J. Duraud 2 , A. Chausse 1 , R. Messina 1 and P. Toulhoat 1 ,3. Corresponding author: florence. Two RBS simulation codes "RUMP" and "PERM" , whose approaches are different, have been applied to the treatment of the RBS data and have allowed to obtain informations about the structure thickness and atomic elemental composition of the passivating layer.
These two codes provide similar results.
go The passivating layer has a thickness in the range nm. Its structure appears to be complex with the presence of two different sublayers respectively composed of the reduction products of the salt in the inner sublayer with the main presence of fluorine and sulphur indicating the possible existence of LiF and Li 2 S and reduction products of the solvents in the outer sublayer with a high concentration in oxygen indicating the presence of Li 2 CO 3 and RCO 3 Li where R is an alkyl radical.
PACS: Yc — Rutherford backscattering RBS , and other methods of chemical analysis.
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