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Ion Beam Diagnosis of Crystalline Materials

ION BEAM DIAGNOSIS OF CRYSTALLINE MATERIALS By Debjit Kar (Y8760) Under guidance of Prof.V.N. Kulkarni Basic theory of Rutherford backscattering (RBS)     This is basically an event of elastic collision of mono-energetic particles from the target. There are basically four basic physical phenomenon involved in the collision: Energy transfer from a projectile to target nucleus in an elastic two body collision. This process leads to the concept of the Kinematic factor and the capability of
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  ByDebjit Kar (Y8760) Under guidance of Prof. V.N. Kulkarni ION BEAM DIAGNOSIS OFCRYSTALLINE MATERIALS  Basic theory of Rutherfordbackscattering (RBS) This is basically an event of elastic collision of mono-energetic particles from the target.There are basically four basicphysical phenomenoninvolved in the collision:  Energytransferfromaprojectiletotargetnucleusinanelastictwobodycollision.Thisprocessleadstotheconceptofthe Kinematic factor  andthecapabilityofmassperception.  Likelihoodofoccurrenceofsuchatwo-bodycollision.Thisleadstotheconceptof  scattering cross section andthecapabilityofquantitativeanalysisof atomiccomposition.  Averageenergylossofanatommovingthroughadensemedium.Thisleadstotheconceptof  stoppingcross section tothecapabilityofdepthperception.  Statisticalfluctuationintheenergylossofanatommovingthroughadensemedium.Thisprocessleadstotheconceptof  energy straggling andtoalimitationintheultimatemassandthedepthresolutionofbackscatteringspectrometry.  Experimental set-up Itconsistsofmainlythreemainstages: 1) Productionofionsandacceleration,usingthe1.7MVTandetronaccelerator. 2) PreparationoftheRBSchamber. 3) Preparationoftheelectronicsforthedetector.  Tandetronaccelerator: This accelerator is made by High Voltage Engineering Europa(HVEV), which is a high current Tandem accelerator. The terminal voltage is in the range of 100 KV-1.7MV, generated by solid-state parallel fed Cockroft-Walton type voltagegenerator, with high voltage stability 30V and low terminal voltage ripple. The H-ions have been generated by the duoplasmatronion source model 358. The maximum currentavailable for H + and He + are 25 μ Aand 2 μ Arespectively. The RBS and channelingchamber have been set at 45 0 exit angle by the switching magnet.  RBS chamber: It consists of the following basic parts-a sample holder, a suppressor anda surface barrier Si detector.  Electronic set-up: The current from the detector has been initially amplified by the pre-amplifier. The subsequent main amplifier amplifying this signal creates a suitable pulseshape, thus optimizing resolution and count rate capability.  RBS of the sample Audeposited on Al using H +  Ions: H +  Charge state: 1  Energy: 2020 KeV  Scattering angle:165 0  Solid angle: .966msr  Beam current: 5 nA  Fluence: 2E+15 μ C  Energy/channel:4.14 KeV  Detectorresolution: 15 KeV  Thickness: 32 μ m(exp.) and 14 μ m(sim.)
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