A pulsing system for low energy positrons

Schödlbauer, D.; Sperr, P.; Kögel, G.; Triftshäuser, W.

doi:10.1016/0168-583x(88)90752-5

Cited by 74 publications

(28 citation statements)

References 18 publications

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“…The innovation by Kratschmer et al (1990) (Schaefer et al , 1992a(Schaefer et al , , 1992b Horsky et al , 1992), positron microscopy (Brandes et al , 1988;Van House and Rich, 1988) and beam-based lifetime techniques (Schodlbauer et al , 1988 …”

Section: Fullerenes and Related Materialsmentioning

confidence: 99%

Theory of positrons in solids and on solid surfaces

1994

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Various experimental methods based on positron annihilation have evolved into important tools for researching the structure and properties of condensed matter. In particular, positron techniques are useful for the investigation of defects in solids and for the investigation of solid surfaces. Experimental methods need a comprehensive theory for a deep, quantitative understanding of the results. In the case of positron annihilation, the relevant theory includes models needed to describe the positron states as well as the different interaction processes in matter. In this review the present status of the theory of positrons in solids and on solid surfaces is given. The review consists of three main parts describing (a) the interaction processes, {b) the theory and methods for calculating positron states, and {c)selected recent results of positron studies of condensed matter. CONTENTS

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Section: Fullerenes and Related Materialsmentioning

confidence: 99%

Theory of positrons in solids and on solid surfaces

1994

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“…The timing signal may be obtained from secondary electrons produced by a positron impinging on the sample surface [15]. Alternatively, it may be provided from beam bunching electronics in a pulsed positron beam [16,17]. In either case, a PAL spectrum is obtained, similarly to conventional PALS, by recording the time interval between the timing signal and the detection of an annihilation g-ray.…”

Section: Combination Of Dbar and Pals With Variable-energy Positron Bmentioning

confidence: 99%

Application of positron beams to the study of positronium-forming solids

Kobayashi

Ito

Oka

et al. 2008

Applied Surface Science

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“…A similar system will also be used in the data collection of the pulsed positron lifetime beam under construction at Helsinki University of Technology. The digital measurement is particularly suitable to this purpose since even the small problems related to coincidence detection and continuous triggering by the pulsing frequency are avoided [4].…”

Section: Discussionmentioning

confidence: 99%

Digital measurement of positron lifetime

Rytsölä

Nissilä

Kokkonen

et al. 2002

Applied Surface Science

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A prototype of a digital positron lifetime apparatus is presented. We demonstrate that direct digitizing of detector pulses and subsequent simple analysis with software, can be used to replace the conventional analog electronics chain (constant-fraction discriminators, time-to-amplitude converter and multichannel analyzer). In this work, we use a fast digital oscilloscope. The quality of the lifetime data is shown to be as good as with a usual apparatus. For a pulsed positron lifetime beam the digital system is particularly suitable as no coincidence detection is needed and only one analog pulse has to be analyzed. #

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A pulsing system for low energy positrons

Cited by 74 publications

References 18 publications

Theory of positrons in solids and on solid surfaces

Theory of positrons in solids and on solid surfaces

Application of positron beams to the study of positronium-forming solids

Digital measurement of positron lifetime

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