Positron Annihilation Doppler Broadening Study of the Helium-implanted (ODS) EUROFER

A new type of a positron annihilation lifetime spectroscopy (PALS) system has been set up at the superconducting electron accelerator ELBE [ at Helmholtz-Zentrum Dresden-Rossendorf. In contrast to existing source-based PALS systems, the approach described here makes use of an intense photon beam from electron bremsstrahlung which converts through pair production into positrons inside the sample under study. The article focusses on the production of intense bremsstrahlung using a superconducting electron linear accelerator, the production of positrons inside the sample under study, the efficient detector setup which allows for annihilation lifetime and Doppler-broadening spectroscopy simultaneously. Selected examples of positron annihilation spectroscopy are presented.

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Ion implantation of58Co for positron-annihilation Doppler-broadening measurements

Applied Physics ◽

10.1007/bf00900401 ◽

1981 ◽

Vol 24 (1) ◽

pp. 67-69 ◽

Cited By ~ 4

Author(s):

M. J. Fluss ◽

M. K. Chason ◽

J. L. Lerner ◽

D. G. Legnini ◽

L. C. Smedskjaer

Keyword(s):

Ion Implantation ◽

Positron Annihilation ◽

Doppler Broadening

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Spin-polarized positron annihilation measurements of polycrystalline Fe, Co, Ni, and Gd based on Doppler broadening of annihilation radiation

Physical Review B ◽

10.1103/physrevb.83.100406 ◽

2011 ◽

Vol 83 (10) ◽

Cited By ~ 19

Author(s):

Atsuo Kawasuso ◽

Masaki Maekawa ◽

Yuki Fukaya ◽

Atsushi Yabuuchi ◽

Izumi Mochizuki

Keyword(s):

Positron Annihilation ◽

Annihilation Radiation ◽

Doppler Broadening ◽

Spin Polarized

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Calculation of the Doppler broadening of the electron-positron annihilation radiation in defect-free bulk materials

Physical Review B ◽

10.1103/physrevb.61.10092 ◽

2000 ◽

Vol 61 (15) ◽

pp. 10092-10099 ◽

Cited By ~ 58

Author(s):

V. J. Ghosh ◽

M. Alatalo ◽

P. Asoka-Kumar ◽

B. Nielsen ◽

K. G. Lynn ◽

...

Keyword(s):

Positron Annihilation ◽

Annihilation Radiation ◽

Doppler Broadening ◽

Bulk Materials ◽

Electron Positron Annihilation ◽

Electron Positron

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Chemical analysis of precipitates in metallic alloys using coincidence Doppler broadening of positron annihilation radiation

Radiation Physics and Chemistry ◽

10.1016/s0969-806x(00)00250-4 ◽

2000 ◽

Vol 58 (5-6) ◽

pp. 737-742 ◽

Cited By ~ 22

Author(s):

Y. Nagai ◽

Z. Tang ◽

M. Hasegawa

Keyword(s):

Chemical Analysis ◽

Positron Annihilation ◽

Metallic Alloys ◽

Annihilation Radiation ◽

Doppler Broadening ◽

Coincidence Doppler Broadening

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The Evolution Behavior of Defects in the Nanofilms of W/Cu and W Probed by Doppler Broadening Positron Annihilation Spectroscopy

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.373.104 ◽

2017 ◽

Vol 373 ◽

pp. 104-107

Author(s):

Ling Wang ◽

Ai Hong Deng ◽

Kang Wang ◽

Yong Wang ◽

Xiao Bo Lu ◽

...

Keyword(s):

Magnetron Sputtering ◽

Positron Annihilation ◽

Room Temperature ◽

Storage Time ◽

Positron Annihilation Spectroscopy ◽

Doppler Broadening ◽

Radio Frequency Magnetron Sputtering ◽

Helium Ions ◽

Near Surface ◽

Evolution Behavior

W/Cu multilayer nanofilms and pure W nanofilms were prepared in pure Ar and He/Ar mixing atmosphere by radio frequency magnetron sputtering method. The defect evolution of the samples was characterized by Doppler broadening positron annihilation spectroscopy (DB-PAS).The results show that plenty of defects can be produced by introducing helium (He) into W/Cu multilayer nanofilms. With the natural storage time increasing, the helium located in the near surface of W/Cu multilayer nanofilm would be released gradually and induce the coalescence of the helium related defects due to the diffusion of the helium and defects. In addition, the pure W nanofilms were irradiated by 30 keV helium ions and 40 keV hydrogen (H) ions in sequence at room temperature. From the DB-PAS analysis, it can be shown that a large number of vacancy-type defects are produced due to the He and/or H irradiation. H ions would be trapped by He related defects and produced He-H-V complexes.

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