positron annihilation lifetime spectroscopy
Gas permeation and positron annihilation lifetime spectroscopy of poly(ether imides) containing main chain ethylene oxide segments
... Positron Annihilation Lifetime Spectroscopy –PALS Numerous studies have shown the correlation between positron annihilation and gas transport ...(o-Ps) annihilation in ...
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The interaction in sorbitol-plasticized starch bionanocomposites via positron annihilation lifetime spectroscopy and small angle X-ray scattering
... 2010). Positron annihilation lifetime spectroscopy (PALS) is an important technique for measuring polymer free volume (Donald, 2001) and has been applied in polymer science with the aim to ...
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Photoluminescence and positron annihilation lifetime studies on pellets of ZnO nanocrystals
... Positron annihilation lifetime spectroscopy was used to investigate thermally induced evolution of defects in ZnO ...nanocrystals. Positron trapping in open-volume defects, such as in ...
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Positron Annihilation Lifetime Study of Steel Surface Modification by Shot Peening
... by positron annihilation lifetime spectroscopy was studied for various ...in positron annihilation lifetime spectra caused by shot ...
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Effect of Annealing Temperature on Prepared Nanoparticles Li Ferrite Using Positron Annihilation Lifetime Technique
... temperature. Positron annihilation lifetime spectroscopy (PALS) was used to study defects at different sites for nano- grains ...two lifetime components τ 1 and τ ...
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Bulky Averaged Microscopic Information for ECAP Processed Cu Using Accelerator Based Gamma Ray Induced Positron Annihilation Spectroscopy and Neutron Diffraction
... Severe plastic deformation (SPD) has been used to produce ultrafine-grained materials. 1,2) Equal-channel angular press- ing (ECAP) is a processing technique used to achieve SPD. It has been reported that the dislocation ...
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S Parameter and Positron Lifetime Studies of Mn Doped Zn1 Xox
... INTRODUCTION Positron annihilation lifetime spectroscopy (PALS) serves as a unique tool for the characterization of lattice defects in materials ...the annihilation lifetime ...
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POSITRON ANNIHILATION SPECTROSCOPY
... of positron trapping, additional exponential components occur in measured positron lifetime ...the positron can form a bound state with a host electron, positronium (Ps), which is an analogue ...
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Detection of deuterium trapping sites in tungsten by thermal desorption spectroscopy and positron annihilation spectroscopy
... desorption spectroscopy (TDS) of tungsten implanted with D 2 + ions was performed after irra- diation with 8 MeV-electrons, ...discussed. Positron annihilation lifetime (PAL) measurements of ...
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Development of Positron Annihilation Spectroscopy Techniques Applied to Damaged Polyimide Film
... The lifetime observed in the LNT Kapton sample implanted with 50keV oxygen is much smaller than for the gallium implanted sample, but has a much larger associated weighting, suggesting that the interplay between ...
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Nonlinear Loading Effects in Oxide filled Polyester Nanocomposites Observed by IR spectroscopy and Lifetime Positron Spectroscopy
... Thus, the present study was undertaken to investigate alterations in the electronic structure of styrene cross-linked unsaturated polyester resin caused by nanosized titanium dioxide and silica-titania fumed oxide with ...
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Detection of phase separation of neutron-irradiated Fe–Cr binary alloys using positron annihilation spectroscopy
... using positron annihilation lifetime measurements, but were not detected in Fe –xCr (x = 70, 85, and 91) irradiated at 473 K or in any samples irradiated at 573 ...
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Positron Annihilation Spectroscopy to Characterize Irradiation Induced Vacancy Type Defects in Materials for Nuclear Fission and Fusion
... Positron annihilation spectroscopy (PAS) is a well-established technique to characterize materials ...charge, positron is sensitive to the local variations of the Coulomb potential in ...
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Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high resolution argon adsorption
... reduced lifetime is observed for Ps micro1 in the pillared samples with respect to UTL, and the presence of non-hydrolyzed UTL layers is not detected by powder ...upon positron implantation, they can probe ...
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EL2 deep-level transient study in semi-insulating GaAs using positron-lifetime spectroscopy
... INTRODUCTION Positron annihilation lifetime ~PAL! spectroscopy has proved to be a valuable nondestructive probe for vacancy- type defects in GaAs, having revealed the presence of V As , 1,2 V ...
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Influence of Plasma Spray and HVOF Coatings using Advanced Techniques on the Mechanical Properties; A Positron Lifetime Spectroscopy
... III. M ATERIALS & M ETHODS The HVOF & plasma techniques to coat chromium oxide and chromium carbide on mild steel substrate have been used in this investigation. The thicknesses of chromium oxide and chromium carbide ...
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Detection of Neodymium Rich Phase for Development of Coercivity in Neodymium Iron Boron Based Alloys with Submicron Sized Grains Using Positron Lifetime Spectroscopy
... Positron lifetime spectroscopy 1–3) is a unique technique for obtaining information on the structural characteristics of positron annihilation sites, typically atomic-scale lattice ...
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Positron Annihilation lifetime studies of inorganic materials using a new positron beamline
... 3.1.4 Confinement & Guidance Moderated positrons are radially confined using a strong axial magnetic field. This field is generated along the length of the beamline using several different solenoids; these will be ...
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Metal Semiconductor Interfaces Investigated by Positron Annihilation Spectroscopy
... Variable-energy positron annihilation spectroscopy has been applied to study interfaces in Al/Si, Au/Si and Au/GaAs ...the positron work function of these materials were taken into ...
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Design and Implementation of a Digital Positron Annihilation Lifetime Spectrometer for Measurements in Graphite
... produced lifetime spectra show that a PALS data set is more resolvable with more counts as opposed to having a better timing resolution to the detriment of count rate ...keV annihilation quanta in both ...
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