Production and Applications of Intense Pulsed, Slow Positron Beams

O’Rourke, Brian; Oshima, Nobuyuki; Kinomura, A.; Ohdaira, Toshiyuki; Suzuki, Ryoichi

doi:10.4028/www.scientific.net/ddf.331.75

Cited by 6 publications

(2 citation statements)

References 55 publications

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“…Processing protocols are commonly designed, in part, to suppress inferred relevant point defects, progress in unambiguous experimental identification in device, or near device, material is of clear importance. Facilities are in place that enable both PALS and CDBS to be performed on thin films, 38,39 in addition to the more widely available conventional studies of bulk samples.…”

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confidence: 99%

Characterization of point defects in CdTe by positron annihilation spectroscopy

El-Sharkawy

Kanda

Abdel-Hady

et al. 2016

Applied Physics Letters

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Positron lifetime measurements on CdTe 0.15% Zn-doped by weight are presented, trapping to monovacancy defects is observed. At low temperatures, localization at shallow binding energy positron traps dominates. To aid defect identification density functional theory, calculated positron lifetimes and momentum distributions are obtained using relaxed geometry configurations of the monovacancy defects and the Te antisite. These calculations provide evidence that combined positron lifetime and coincidence Doppler spectroscopy measurements have the capability to identify neutral or negative charge states of the monovacancies, the Te antisite, A-centers, and divacancy defects in CdTe.

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mentioning

confidence: 99%

Characterization of point defects in CdTe by positron annihilation spectroscopy

El-Sharkawy

Kanda

Abdel-Hady

et al. 2016

Applied Physics Letters

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“…The principle of such a method is well known [15]. However, it is used yet with the harmonic RF voltage [16,17].…”

Section: Principle Of Formation Of the Ordered Positron Flux (Opf)mentioning

confidence: 99%

Development of Positron Annihilation Spectroscopy at Joint Institute for Nuclear Research

et al. 2019

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The method of Positron Annihilation Spectroscopy (PAS) has been under development and application since 2013 at the Low Energy Particle Toroidal Accumulator (LEPTA) facility in the Dzhelepov Laboratory of Nuclear Problems of JINR. The PAS at the LEPTA is based on the slow positron injector of original design that provides a positron flux of a high monochromaticity. The FWHM of positron energy at the exit of the positron source is of 1.5-3 eV. The positron energy on the target can be varied in the range 50 eV-36 keV (90 keV in the nearest future) with an accuracy of not less than 1%. The first version of a special channel for transportation of the positrons from the source to the target was constructed in 2013. Presently the research is carried out applying the method of the Doppler Broadening of Annihilation Line. In 2018 the channel was developed for application of Positron Annihilation Lifetime Spectroscopy. It will be equipped with instrumentation according to original scheme presented in this article. This article describes three versions of PAS, their peculiarities and specific scheme as well as the parameters of the experimental equipment for PAS used and developed at LEPTA.

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