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Positron Annihilation Spectroscopy of KCl (Zn) crystals
Applied Radiation and Isotopes, 2020Four samples of nominally pure KCl crystals and doped with Zn2+ impurities are grown by the Czochralski method and characterized by X-ray diffraction and Proton Induced X-ray Emission techniques. Positron Annihilation Lifetime Spectroscopy (PALS) is performed to obtain information on the cation vacancy type defects and their evolution under doping. The
Omidreza Kakuee
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Positron Annihilation Spectroscopy for Chemical Analysis
Critical Reviews in Analytical Chemistry, 1989The prediction and discovery of the existence of positron (e+)1-4 and positronium atom (Ps)5,6 led rapidly to the development of a new spectroscopic technique for the study of the structure and composition of matter. The technique quickly expanded across interdisciplinary from physics to chemistry, metallurgy, biochemistry and recently to ...
K L, Cheng, Y C, Jean, X H, Luo
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Pore Topology Effects in Positron Annihilation Spectroscopy of Zeolites [PDF]
ChemPhysChem, 2017 AbstractPositron annihilation spectroscopy (PAS) is a powerful method to study the size and connectivity of pores in zeolites. The lifetime of positronium within the host material is commonly described by the Tao‐Eldrup model. However, one of its largest limitations arises from the simple geometries considered for the shape of the pores, which cannot ...
Paolo Crivelli +2 more
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Positron Annihilation Spectroscopy
Annual Review of Materials Science, 1980Positron annihilation spectroscopy (PAS) has in recent years become an increasingly valuable tool for the study of the electronic and defect struc tures of materials. Owing to the ability of the positron to annihilate from a variety of specific states in solids, ranging from an extended state in a defect-free lattice to highly localized states in ...
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Particle Spectroscopy: Positron annihilation
Physics Bulletin, 1985The 7th international conference on positron annihilation was held in New Delhi on 6–11 January 1985–the most prestigious meeting in the positron calendar. A modest but active contingent of British delegates from the universities of East Anglia and London and from Vacuum Generators travelled to India to attend, and 29 countries were represented by over
Stephen Hutchins +2 more
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Positron annihilation spectroscopy and micellar systems
Advances in Colloid and Interface Science, 1995Positron annihilation spectroscopy (PAS) has emerged as a powerful technique for investigating structural changes, phase transitions and microenvironmental transformations in a variety of systems. The process of molecular aggregation in micellar systems is known to be cooperative and size limited; it shows features similar to that of a classical phase ...
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Positron Annihilation Spectroscopy (PAS)
2004Positron annihilation spectroscopy (PAS) was established in the early 70’s as a laboratory method with high sensitivity to measure and distinguish between thermally generated single and divacancies in pure metals. From there, PAS has been developed to investigate many kinds of open volume defects in metals, semiconductors, ceramics, and polymers ...
G. Dlubek, N. Meyendorf
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Positron Annihilation Spectroscopy at LEPTA Facility
Materials Science Forum, 2012The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS) [1]. The positron injector of the LEPTA facility can generate continuous a slow positron beam with the intensity up to 1∙107s-1 at the energy in the range of a few eV to 100 keV and width
Aleksey A. Sidorin +8 more
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Positron annihilation spectroscopy in YBa2Cu3O7−x
Physica C: Superconductivity, 1988Abstract Doppler-broadened annihilation radiation (DBAR) spectra have been measured in the high-Tc orthorhombic YBa2Cu3O7−x (superconductor) and a similar tetragonal YBCO compound (non-superconductor) as a function of temperature between 77 K and 300 K. Analyses of these spectra bring out certain interesting features.
P.K. Pujari +7 more
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