Solid State Physics at ISOLDE

Deicher, M.; Weyer, G.; Wichert, Th.

doi:10.1023/b:hype.0000020422.39876.97

Cited by 14 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed electron yield with respect to the main crystallographic directions is fitted to theoretical patterns obtained with the manybeam formalism [14]. Such approach can distinguish positions separated by as little as $0.03 Å. EC investigations have been performed at the ISOLDE facility at CERN [15,16], where radioactive isotopes are produced via spallation, fission or fragmentation reactions in thick targets, induced by proton beams from a proton synchrotron booster (PSB) at energies and intensities to up to 1.4 GeV and 2 lA, respectively.…”

Section: Methodsmentioning

confidence: 99%

Drawing the geometry of 3d transition metal-boron pairs in silicon from electron emission channeling experiments

Silva

Wahl

Correia

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

a b s t r a c tAlthough the formation of transition metal-boron pairs is currently well established in silicon processing, the geometry of these complexes is still not completely understood. We investigated the lattice location of the transition metals manganese, iron, cobalt and nickel in n-and p þ -type silicon by means of electron emission channeling. For manganese, iron and cobalt, we observed an increase of sites near the ideal tetrahedral interstitial position by changing the doping from n-to p þ -type Si. Such increase was not observed for Ni. We ascribe this increase to the formation of pairs with boron, driven by Coulomb interactions, since the majority of iron, manganese and cobalt is positively charged in p þ -type silicon while Ni is neutral. We propose that breathing mode relaxation around the boron ion within the pair causes the observed displacement from the ideal tetrahedral interstitial site. We discuss the application of the emission channeling technique in this system and, in particular, how it provides insight on the geometry of such pairs.

show abstract

Section: Methodsmentioning

confidence: 99%

Drawing the geometry of 3d transition metal-boron pairs in silicon from electron emission channeling experiments

Silva

Wahl

Correia

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

show abstract

“…Several reviews on emission channeling can be found in the literature [34][35][36][37]. The production of radioisotopes and implantation into single-crystalline ZnO and thin film GaN samples at 60 keV and fluences around 1-3×10 13 cm −2 was done at CERN's ISOLDE facility [38,39]. A position-sensitive electron detector was used in order to measure the angle-dependent electron emission yield around various crystallographic directions [40].…”

Section: Methodsmentioning

confidence: 99%

Recent Emission Channeling Studies in Wide Band Gap Semiconductors

Wahl¹,

Correia²,

Rita³

et al. 2005

Hfi/Nqi 2004

View full text Add to dashboard Cite

Abstract. We present results of recent emission channeling experiments on the lattice location of implanted Fe and rare earths in wurtzite GaN and ZnO. In both cases the majority of implanted atoms are found on substitutional cation sites. The root mean square displacements from the ideal substitutional Ga and Zn sites are given and the stability of the Fe and rare earth lattice location against thermal annealing is discussed.

show abstract

“…PAC allows measuring the electric field gradient (EFG) and the magnetic field that a suited probe nucleus experiences on its lattice site in a solid. Initially the bulk of the experiments at ISOLDE concentrated on semiconductors and on metal surfaces, and has been well reviewed in the past [7][8][9][10][11][12][13][14][15][16]. During the last couple of years, the PAC work at ISOLDE in the field of semiconductors has concentrated on experiments using the probes 111 In, 111m Cd, 115 Cd, 117 Cd, and 111 Ag in the nitride semiconductors GaN and AlN.…”

Section: Perturbed Angular Correlationmentioning

confidence: 99%

“…Over the years, the ISOLDE materials science program or parts thereof have been reviewed at various times in the literature [6][7][8][9][10][11][12][13][14][15][16]. This paper gives an overview on the recent (~last 5 years) research activities in materials science and biophysics at ISOLDE, together with a brief outlook on the new developments under way.…”

Section: Introductionmentioning

confidence: 99%

Materials science and biophysics applications at the ISOLDE radioactive ion beam facility

Wahl

2011

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

The ISOLDE isotope separator facility at CERN provides a variety of radioactive ion beams, currently more than 800 different isotopes from ~65 chemical elements. The radioisotopes are produced on-line by nuclear reactions from a 1.4 GeV proton beam with various types of targets, outdiffusion of the reaction products and, if possible, chemically selective ionisation, followed by 60 kV acceleration and mass separation. While ISOLDE is mainly used for nuclear and atomic physics studies, applications in materials science and biophysics account for a significant part (currently ~15%) of the delivered beam time, requested by 18 different experiments. The ISOLDE materials science and biophysics community currently consists of ~80 scientists from more than 40 participating institutes and 21 countries. In the field of materials science, investigations focus on the study of semiconductors and oxides, with the recent additions of nanoparticles and metals, while the biophysics studies address the toxicity of metal ions in biological systems. The characterisation methods used are typical radioactive probe techniques such as Mössbauer spectroscopy, perturbed angular correlation, emission channeling, and tracer diffusion studies. In addition to these "classic" methods of nuclear solid state physics, also standard semiconductor analysis techniques such as photoluminescence or deep level transient spectroscopy profit from the application of radioactive isotopes, which helps them to overcome their chemical "blindness" since the nuclear half life of radioisotopes provides a signal that changes in time with characteristic exponential decay or saturation curves. In this presentation an overview will be given on the recent research activities in materials science and biophysics at ISOLDE, presenting some of the highlights during the last five years, together with a short outlook on the new developments under way.

show abstract

Solid State Physics at ISOLDE

Cited by 14 publications

References 22 publications

Drawing the geometry of 3d transition metal-boron pairs in silicon from electron emission channeling experiments

Drawing the geometry of 3d transition metal-boron pairs in silicon from electron emission channeling experiments

Recent Emission Channeling Studies in Wide Band Gap Semiconductors

Materials science and biophysics applications at the ISOLDE radioactive ion beam facility

Contact Info

Product

Resources

About