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29 results on '"Positron trapping"'

1. Positron Annihilation in IR Transmitting GeS2-Ga2S3 Glasses

Author

R. Szatanik, Adam Ingram, Olha Shpotyuk, Laurent Calvez, Changgui Lin, Halyna Klym, and Elena Petracovschi

Subjects
010302 applied physics, Void (astronomy), Materials science, Chalcogenide glass, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Positron trapping, Atomic and Molecular Physics, and Optics, Nuclear physics, 0103 physical sciences, Annihilation radiation, General Materials Science, Atomic physics, 0210 nano-technology, Spectroscopy, Positron annihilation, Doppler broadening
Abstract

Positron annihilation lifetime spectroscopy combined with Doppler broadening of annihilation radiation was applied to study free-volume entities in GeS2-Ga2S3glasses affected by Ga additions. It is shown that Ga-related void sub-system plays a decisive role in positron trapping process, while the overall density variation is defined mainly by Ge-related sub-system. These results serve as basis for new characterization route for inner free-volume structure of these glasses.

Published
2015

2. Positron Annihilation at Planar Defects in Oxides

Author

Jakub Čížek, W. Anwand, Jan Kuriplach, Oksana Melikhova, Ivan Procházka, and Gerhard Brauer

Subjects
Materials science, stacking fault, Astrophysics::High Energy Astrophysical Phenomena, Binding energy, Stacking, chemistry.chemical_element, Molecular physics, Positron annihilation spectroscopy, Condensed Matter::Materials Science, Nuclear magnetic resonance, Positron, planar defects, positron trapping, General Materials Science, Cubic zirconia, Mechanical Engineering, zinc oxide, Yttrium, Condensed Matter Physics, grain boundary, chemistry, Mechanics of Materials, Physics::Accelerator Physics, High Energy Physics::Experiment, Grain boundary, zirconia, Stacking fault
Abstract

Planar defects may exhibit free volumes which, in principle, are detectable using positron annihilation spectroscopy. In this contribution, we present a preliminary theoretical study of positron trapping at stacking faults in zinc oxide and at a grain boundary in zirconia. In particular, we calculate the positron lifetime and positron binding energy to such defects. In the case of the grain boundary in zirconia, the influence of the yttrium segregation on the GB structure and positron characteristics is also examined. Calculated structural and positron characteristics are critically compared with experimental and other calculated data.

Published
2012

3. Positron Irradiation Effects in HDPE during PAL Measurement at Ambient Temperature

Author

Magdalena Ziąbka and Jerzy Kansy

Subjects
chemistry.chemical_classification, Materials science, Astrophysics::High Energy Astrophysical Phenomena, Mechanical Engineering, Polymer, Condensed Matter Physics, Positron trapping, Spectral line, Positronium, Nuclear physics, Positron, chemistry, Mechanics of Materials, Physics::Accelerator Physics, High Energy Physics::Experiment, General Materials Science, High-density polyethylene, Irradiation, Atomic physics, Positron annihilation
Abstract

The positron irradiation effect in high density polyethylene at ambient temperature is studied by positron annihilation lifetime method. The positron spectra are analyzed with a model which takes into account positron trapping and so called delayed formation of positronium (DFP). A good relationship is noticed between the rate of positron trapping and the rate of DFP.

Published
2012

4. Thermal Vacancy Formation and Diffusion in Nanocrystalline Materials

Author

Roland Würschum

Subjects
Crystallography, Void (astronomy), Materials science, Mechanics of Materials, Mechanical Engineering, Vacancy defect, Thermal, General Materials Science, Grain boundary, Composite material, Condensed Matter Physics, Positron trapping, Nanocrystalline material
Published
2001

7. Influence of the Layer Oxidation on the Electrical Conductivity and the Positron Trapping in the Polycrystalline ZnCr2Se4 and CuCr2Se4 Spinels

Author

J. Wolff, Tadeusz Groń, K. Bärner, and I. Okońska-Kozłowska

Subjects
Materials science, Condensed matter physics, Spinel, engineering.material, Condensed Matter Physics, Positron trapping, Atomic and Molecular Physics, and Optics, Electrical resistivity and conductivity, Seebeck coefficient, engineering, General Materials Science, Crystallite, Layer (electronics), Positron annihilation
Published
1999

9. Positron Trapping in Deformed Copper Down to Millikelvins

Author

C. Tramm, I. Müller, Karin Maier, Christiane Zamponi, M. Haaks, Torsten E.M. Staab, and P. Herzog

Subjects
Antiparticle, Materials science, Condensed matter physics, Mechanical Engineering, chemistry.chemical_element, Trapping, Condensed Matter Physics, Molecular physics, Crystallographic defect, Copper, Positron trapping, Positron, chemistry, Mechanics of Materials, Antimatter, General Materials Science, Deformation (engineering)
Published
2004

11. Electronic Structure and Positron Trapping in Semiconductors

Author

Risto M. Nieminen

Subjects
Materials science, Deep level, Condensed matter physics, business.industry, Mechanical Engineering, Electronic structure, Condensed Matter Physics, Positron trapping, Semiconductor, Mechanics of Materials, Relaxation (physics), General Materials Science, Atomic physics, business
Published
1994

12. Positron 2D-ACAR Study on Divacancies in Si

Author

Atsuo Kawasuso, Toshinobu Chiba, Takashi Akahane, Masuyuki Hasegawa, Masashi Suezawa, and Koji Sumino

Subjects
Thesaurus (information retrieval), Positron, Materials science, Mechanics of Materials, Mechanical Engineering, General Materials Science, Condensed Matter Physics, Positron trapping, Engineering physics, Positron annihilation
Published
1994

13. Positron Trapping at a Negatively Charged as Vacancy in GaAs

Author

Giorgio Galli, Alfred A. Manuel, L. Gilgien, R. Ambigapathy, Roberto Car, and Francois Gygi

Subjects
Materials science, Mechanics of Materials, Mechanical Engineering, Vacancy defect, General Materials Science, Atomic physics, Condensed Matter Physics, Positron trapping, Simulation
Published
1994

14. Experimental Determination of the Specific Positron Trapping Rates in Semiconductors

Author

A. Polity, Reinhard Krause-Rehberg, and Th. Abgarjan

Subjects
Semiconductor, Materials science, Condensed matter physics, Mechanics of Materials, business.industry, Mechanical Engineering, Vacancy defect, General Materials Science, Dislocation, Atomic physics, Condensed Matter Physics, business, Positron trapping
Published
1994

16. Summary Talks: Defects and Fundamentals

Author

Morten Mostgaard Eldrup

Subjects
Nuclear physics, Particle physics, Materials science, Mechanics of Materials, Mechanical Engineering, General Materials Science, Condensed Matter Physics, Positron trapping, Positron annihilation, Positronium
Published
1994

18. Formation of Vacancy Clusters During Copper Diffusion in Semiinsulating GaAs

Author

K. Petters, Reinhard Krause-Rehberg, J. Gebauer, F. Redmann, and Hartmut S. Leipner

Subjects
Annihilation, Materials science, Condensed matter physics, Annealing (metallurgy), Mechanical Engineering, Radiochemistry, chemistry.chemical_element, Condensed Matter Physics, Copper, Positron trapping, Positron, Diffusion process, chemistry, Mechanics of Materials, Vacancy defect, General Materials Science
Abstract

[1] R.N. Hall, J.H. Racette, J. Appl. Phys. 35 (1964) 379. [2] F.C. Frank, D. Turnbull, Phys. Rev. 104 (1956) 617. [3] R. Leon, P. Werner, K.M. Yu, M. Kaminska, E.R. Weber, Appl. Phys. A 61 (1995) 7. [4] H. S. Leipner, R. F. Scholz, F. Syrowatka, J. Schreiber, P. Werner, Phil. Mag. A (1999) . after Cu-indiffusion and quenching no vacancy-type defects are registered shallow traps are found which are directly related to Cu during annealing vacancy clusters grow and dissolve above 850 K vacancies and clusters are decorated with Cu Distance between possible annihilation centres seen in TEM is much longer than mean positron diffusion length so they have no influence on positron trapping This work: understanding diffusion process and related defects (vacancies) in more detail

Published
2001

19. Positron Diffusion Trapping Model with an External Magnetic Field

Author

P. Golonka

Subjects
Materials science, Positron, Condensed matter physics, Mechanics of Materials, Mechanical Engineering, Monte Carlo method, General Materials Science, Trapping, Magnetic field effect, Diffusion (business), Condensed Matter Physics, Positron trapping, Magnetic field
Published
2001

20. Positron Trapping Model in N-Type Semiconductors with Vacancies

Author

Masao Doyama

Subjects
Materials science, Semiconductor, Condensed matter physics, Mechanics of Materials, business.industry, Mechanical Engineering, Vacancy defect, General Materials Science, Trapping, Condensed Matter Physics, business, Positron trapping
Published
1992

22. Isochronal Annealing Study of Positron Trapping Centres in a Polymer Matrix

Author

H. R. Sreepad, C. Ranganathaiah, A. Chandrashekara, V. Sreeramalu, S. Gopal, and V. Ravindrachary

Subjects
chemistry.chemical_classification, Materials science, Nuclear magnetic resonance, chemistry, Mechanics of Materials, Annealing (metallurgy), Mechanical Engineering, General Materials Science, Polymer, Composite material, Condensed Matter Physics, Positron trapping
Published
1992

23. Positron Trapping Rates and Lifetimes of Vacancy-Impurity Complexes in α-AgSb Alloys

Author

Joachim R. Wolff, J.-E. Kluin, and Theodor Hehenkamp

Subjects
010302 applied physics, Materials science, Mechanical Engineering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Positron trapping, Mechanics of Materials, Impurity, Vacancy defect, 0103 physical sciences, General Materials Science, Atomic physics, 0210 nano-technology
Published
1992

24. Positron Lifetimes in Metals

Author

T. Górecki

Subjects
Positron, Materials science, Mechanics of Materials, Mechanical Engineering, Vacancy defect, Positron Lifetime Spectroscopy, General Materials Science, Atomic physics, Condensed Matter Physics, Positron trapping
Published
1992

25. Positron Trapping by the Platelet Precipitations of AlCu

Author

U. H. Gläser, R. Krause, and G. Dlubek

Subjects
Materials science, Condensed matter physics, Mechanics of Materials, Annealing (metallurgy), Mechanical Engineering, General Materials Science, Condensed Matter Physics, Positron trapping
Published
1992

26. A Model for Positron Trapping at Voids in Metals

Author

G. Trumpy and Bentzon

Subjects
Void (astronomy), Materials science, Mechanics of Materials, Mechanical Engineering, General Materials Science, Composite material, Condensed Matter Physics, Positron trapping
Published
1992

27. Positron Trapping Defects in Neutron-Irradiated Vitreous and Crystalline SiO2

Author

Yasuo Ito, Shozo Yamaguchi, M. Tabata, Masanori Fujinami, Zheng Tang, M. Hasegawa, and M. Saneyasu

Subjects
Metamictization, Materials science, Silica glass, Mechanics of Materials, Mechanical Engineering, Radiochemistry, General Materials Science, Neutron, Irradiation, Condensed Matter Physics, Positron trapping, Quartz, Positron annihilation
Published
1997

28. Positron Trapping at H- and D- Ions in MgO Crystals

Author

Monge, Roberto González, R. Pareja, and Ying Chen

Subjects
Materials science, Mechanics of Materials, Mechanical Engineering, General Materials Science, Atomic physics, Condensed Matter Physics, Positron trapping, Ion
Published
1997

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