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CERN Document Server	Pronađeno je 9 zapisa	Pretraživanje je potrajalo 0.61 sekundi

Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films / Himmerlich, Marcel (CERN) ; Zanin, Danilo A (CERN) ; Taborelli, Mauro (CERN) ; Granadeiro Costa, Angelo Rafael (CERN) ; Costa Pinto, Pedro (CERN) ; Lain Amador, Lucia (CERN) ; Vollenberg, Wilhelmus (CERN) ; Baris, Adrienn (CERN) ; Garcia‐Tabares Valdivieso, Elisa (CERN ; Carlos III U., Madrid) ; Perez Fontenla, Ana Teresa (CERN) et al.
The formation of a fissured copper surface by picosecond pulsed laser irradiation is combined with functional coatings consisting of Ti and amorphous carbon layers or a Ti–Zr–V compound film to fabricate surfaces with the maximum of the secondary electron yield being as low as 0.4. By structural and spectroscopic analysis of the formed surfaces it is demonstrated that both coatings enclose the nanostructures generated by redeposition of metal structures from the laser-induced plasma plume, keeping the initial topography intact. [...]
2022 - 8 p. - Published in : Advanced Materials Interfaces 10 (2022) 2201671 Fulltext: PDF;

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Study of the radiative decay of the low-energy isomer in $^{229}$Th / Chhetri, Premaditya (KU Leuven) ; Bara, Silvia (KU Leuven) ; Beeks, Kjeld (TU Wein) ; Bernerd, Cyril (KU Leuven, CERN) ; Block, Michael (GSI Darmstadt, HIM Mainz, University of Mainz) ; Claessens, Arno (KU Leuven) ; Cocolios, Thomas Elias (KU Leuven) ; Martins Correia, João Guilherme (Universidade de Lisboa) ; Granadeiro Costa, Angelo Rafael (KU Leuven) ; Cottenier, Stefaan (Ghent University) et al.
CERN-INTC-2022-017 ; INTC-P-628. - 2022.
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Lattice sites of implanted Na in GaN and AlN in comparison to other light alkalis and alkaline earths / Wahl, Ulrich (Universidade de Lisboa (PT)) ; David Bosne, Eric (Universidade de Lisboa (PT)) ; Amorim, Lígia (KU Leuven) ; Granadeiro Costa, Angelo Rafael (Universidade de Lisboa (PT)) ; De Vries, Bart (KU Leuven) ; Martins Correia, Joao (Universidade de Lisboa (PT)) ; da Silva, Manuel Ribeiro (CICECO Aveiro) ; Da Costa Pereira, Lino Miguel (KU Leuven (BE)) ; Vantomme, André (KU Leuven) /IS634 Collaboration
The lattice location of ion implanted radioactive 24Na (t1/2=14.96 h) in GaN and AlN was determined using the emission channeling technique at the ISOLDE/CERN facility. In the room temperature as-implanted state in both GaN and AlN, the majority of the sodium atoms are found on interstitial sites near the octahedral position, with a minority on cation Ga or Al substitutional sites. [...]
CERN-ISOLDE-2021-003.- 2020 - 12 p. - Published in : J. Appl. Phys. 128 (2020) 045703 Postprint: PDF; Supplemental Material: PDF;

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Lattice location of impurities in silicon Carbide / Granadeiro Costa, Angelo Rafael
The presence and behaviour of transition metals (TMs) in SiC has been a concern since the start of producing device-grade wafers of this wide band gap semiconductor [...]
CERN-THESIS-2018-072 - 157 p.

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Lattice location of implanted transition metals in 3C–SiC / Granadeiro Costa, Angelo Rafael (Universidade de Lisboa (PT)) ; Wahl, Ulrich (Universidade de Lisboa (PT)) ; Martins Correia, Joao (Universidade de Lisboa (PT)) ; David Bosne, Eric (Universidade de Lisboa (PT)) ; Amorim, Lígia (KU Leuven (BE)) ; Silva, Daniel (Universidade do Porto (PT)) ; Castro Ribeiro Da Silva, Manuel (Universidade de Lisboa (PT)) ; Bharuth-Ram, Krishanlal (University of Kwazulu - Natal (ZA)) ; Da Costa Pereira, Lino Miguel (KU Leuven (BE)) /EC-SLI Collaboration
We have investigated the lattice location of implanted transition metal (TM) 56Mn, 59Fe and 65Ni ions in undoped single-crystalline cubic 3C–SiC by means of the emission channeling technique using radioactive isotopes produced at the CERN-ISOLDE facility. We find that in the room temperature as-implanted state, most Mn, Fe and Ni atoms occupy carbon-coordinated tetrahedral interstitial sites (TC). [...]
CERN-OPEN-2017-022.- Lisboa : Instituto Superior Técnico, 2017 - 11 p. - Published in : J. Phys. D 50 (2017) 215101 Preprint: PDF;

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Emission Channeling with Short-Lived Isotopes (EC-SLI) at CERN’s ISOLDE facility / EC-SLI Collaboration
We give an overview on the historical development and current program for lattice location studies at CERN’s ISOLDE facility, where the EC-SLI (Emission Channeling with Short-Lived Isotopes) collaboration maintains several setups for this type of experiments. We illustrate that the three most decisive factors for the success of the technique are access to facilities producing radioactive isotopes, position-sensitive detectors for the emitted decay particles, and reliable simulation codes which allow for quantitative analysis..
CERN-OPEN-2017-009.- Lisboa, Portugal : Instituto Superior Técnico, 2014 - 11 p. Preprint: PDF; External link: Approve this document (restricted)
In : Proceedings of the First International African Symposium on Exotic Nuclei, Cape Town, South Africa, 1 - 6 Dec 2013

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Identification of the interstitial Mn site in ferromagnetic (Ga,Mn)As / EC-SLI Collaboration
We determined the lattice location of Mn in ferromagnetic (Ga,Mn)As using the electron emission channeling technique. We show that interstitial Mn occupies the tetrahedral site with As nearest neighbors (TAs) both before and after thermal annealing at 200 °C, whereas the occupancy of the tetrahedral site with Ga nearest neighbors (TGa) is negligible. [...]
CERN-OPEN-2017-006.- Leuven, Belgium : Leuven U., 2015 - 5 p. - Published in : Appl. Phys. Lett. 106 (2015) 012406 Preprint: PDF;

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Lattice location of Mg in GaN: a fresh look at doping limitations / EC-SLI Collaboration
Radioactive 27Mg (t1/2=9.5 min) was implanted into GaN of different doping types at CERN’s ISOLDE facility and its lattice site determined via beta− emission channeling. Following implantations between room temperature and 800°C, the majority of 27Mg occupies the substitutional Ga sites, however, below 350°C significant fractions were also found on interstitial positions ~0.6 Å from ideal octahedral sites. [...]
CERN-OPEN-2017-005.- Lisboa, Portugal : Lisbon, IST, 2017 - 5 p. - Published in : Phys. Rev. Lett. 118 (2017) 095501 Preprint: PDF;

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Drawing the geometry of 3d transition metal-boron pairs in silicon from electron emission channeling experiments / Silva, Daniel (Porto U.) ; Wahl, Ulrich (Lisbon, IST) ; Martins Correia, Joao (Lisbon, IST) ; Augustyns, Valerie (Leuven U.) ; De Lemos Lima, Tiago Abel (Leuven U.) ; Granadeiro Costa, Angelo Rafael (Lisbon, IST) ; David Bosne, Eric (Lisbon, IST) ; Castro Ribeiro Da Silva, Manuel (Lisbon U.) ; Esteves De Araujo, Araujo Joao Pedro (Porto U.) ; Da Costa Pereira, Lino Miguel (Leuven U.) /EC-SLI Collaboration
Although 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+-type silicon by means of electron emission channeling. [...]
CERN-OPEN-2017-004.- Leuven, Belgium : Leuven U., 2016 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 371 (2016) 59-62 Fulltext: PDF;

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