Theoretical study of the application of positron-induced Auger-electron spectroscopy

Jensen, Kasper Løvborg; Weiss, A. H.

doi:10.1103/physrevb.41.3928

Cited by 67 publications

(35 citation statements)

References 42 publications

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“…The central quantity for PAES is the annihilation probability with specified core electrons and the ensuing probability of the Auger process. Jensen and Weiss (1990) most prominent (Haghigli et al , 1991a(Haghigli et al , , 1991b. For the insulating system in Fig.…”

Section: Positron-annihilation-inducedmentioning

confidence: 97%

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: Positron-annihilation-inducedmentioning

confidence: 97%

Theory of positrons in solids and on solid surfaces

1994

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“…In contrast, in positron-annihilation-induced Auger electron spectroscopy (PAES), positrons of a few tens eV implanted into the solid do not induce the Auger process, but some are trapped in a potential well at the surface and annihilate the inner atomic shell electrons, creating core-pore excitations, resulting in Auger electron emmission. 33,34 According to this principle, PAES examines only the topmost atomic layer. 35 The energy of the implanted positrons is very low, so that no background of secondary electrons is observed in the higher energy range of released Auger electrons.…”

Section: Application Of Positron Beams 5·1 Positron-annihilation-indumentioning

confidence: 99%

Analytical Methods Using a Positron Microprobe

2009

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Positrons have been used for material analysis not only because of their novel characteristics, such as an ability to detect open-volume type defects in materials, but also because interactions with solids differ from those of electrons in such processes as scattering and diffraction. Monoenergetic positron beams and microbeams were developed in the 1980s, and positron experiments have made progress in material analyses. In this article we review the fundamental technique of microbeam fabrication, especially using a magnetically-guided positron beam, its extension to various analytical methods, and expectations for future research.

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“…Some of the positrons reach the surface and annihilate there with valence or conduction electrons, producing two photons with the energy of 511 keV. In addition, positrons can annihilate with inner shell electrons of target atoms, and two photons of 511 keV are emitted, although the probability is smaller than that with valence or conduction electrons [4]. Thus, while desorption by energetic positrons is expected to be similar to ESD, slow positron impacts with the kinetic energy less than the ESD threshold lead to the desorption through core-hole creation by positron annihilation with inner shell electrons.…”

Section: Introductionmentioning

confidence: 99%