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As$^{\textrm{III}}$ Selectively Induces a Disorder-to-Order Transition in the Metalloid Binding Region of the AfArsR Protein
/ Tóth, Annamária ; Sajdik, Kadosa ; Gyurcsik, Béla ; Nafaee, Zeyad H ; Wéber, Edit ; Kele, Zoltan ; Christensen, Niels Johan ; Schell, Juliana (CERN) ; Correia, Joao Guilherme (CERN) ; Clauss, Kajsa G V Sigfridsson et al.
Arsenic is highly toxic and a significant threat to human health, but certain bacteria have developed defense mechanisms initiated by AsIII binding to AsIII-sensing proteins of the ArsR family. The transcriptional regulator AfArsR responds to AsIII and SbIII by coordinating the metalloids with three cysteines, located in a short sequence of the same monomer chain. [...]
2024 - 14 p.
- Published in : J. Am. Chem. Soc. 146 (2024) 17009-17022
Fulltext: PDF;
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Structural formation yield of GeV centers from implanted Ge in diamond
/ Wahl, Ulrich (IST, Lisbon (main)) ; Correia, João Guilherme (IST, Lisbon (main)) ; Costa, Ângelo (Leuven U.) ; Lamelas, Afonso (Aveiro U.) ; Amaral, Vítor (Aveiro U.) ; Johnston, Karl (CERN) ; Magchiels, Goele (Leuven U.) ; Tunhuma, Shandirai Malven (Leuven U.) ; Vantomme, André (Leuven U.) ; Pereira, Lino M C (Leuven U.)
In order to study the structural formation yield of germanium-vacancy (GeV) centers from implanted Ge in diamond, we have investigated its lattice location by using the β$^{−}$ emission channeling technique from the radioactive isotope $^{75}$Ge (t$_{1/2}$ = 83 min) produced at the ISOLDE/CERN facility. $^{75}$Ge was introduced via recoil implantation following 30 keV ion implantation of the precursor isotope $^{75}$Ga (126 s) with fluences around 2 × 10$^{12}$–5 × 10$^{13}$ cm$^{−2}$. [...]
2024 - 16 p.
- Published in : Mat. Quant. Tech. 4 (2024) 025101
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Magnesium-Vacancy Optical Centers in Diamond
/ Corte, Emilio ; Andrini, Greta ; Nieto Hernández, Elena ; Pugliese, Vanna ; Costa, Ângelo ; Magchiels, Goele ; Moens, Janni ; Tunhuma, Shandirai Malven ; Villarreal, Renan ; Pereira, Lino M. C. et al.
We provide the first systematic characterization of the structural and photoluminescence properties of optically active centers fabricated upon implantation of 30–100 keV Mg+ ions in synthetic diamond. The structural configurations of Mg-related defects were studied by the electron emission channeling technique for short-lived, radioactive 27Mg implantations at the CERN-ISOLDE facility, performed both at room temperature and 800 °C, which allowed the identification of a major fraction of Mg atoms (∼30 to 42%) in sites which are compatible with the split-vacancy structure of the MgV complex. [...]
- Published in : ACS Photonics 10 (2023) 101-110
Fulltext: MgV_SupportingInformation - PDF; ACSPhotonics_2023_10_0101 - PDF;
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Probing structural transitions in M(II) vanadates (M = Zn, Mn, Cd, Ca) with TDPAC spectroscopy
/ Burimova, Anastasia (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Carbonari, Artur Wilson (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Heiniger-Schell, Juliana (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland; Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Leite Neto, Osmar Flavio da Silveira (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Saxena, Rajendra Narain (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Sales, Tatiane da Silva Nascimento (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Genezini, Frederico Antonio (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Pereira, Luciano Fabricio Dias (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Ribeiro Junior, Ibere Souza (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Correa, Bruno Santos (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) et al.
CERN-INTC-2023-023 ; INTC-P-661.
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2023.
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Contactless doping characterization of ${\mathrm{Ga}_{2}\mathrm{O}_{3}}$ using acceptor Cd probes
/ Barbosa, Marcelo B (Porto U. ; Singapore Natl. U.) ; Correia, João Guilherme (IST/ITN, Lisbon ; CERN) ; Lorenz, Katharina (Lisbon, IST) ; Lopes, Armandina M L (Porto U.) ; Oliveira, Gonçalo N P (Porto U.) ; Fenta, Abel S (CERN ; Aveiro U. ; Leuven U.) ; Schell, Juliana (CERN ; U. Duisburg-Essen) ; Teixeira, Ricardo (IST, Lisbon (main)) ; Nogales, Emilio (Madrid U.) ; Méndez, Bianchi (Madrid U.) et al.
Finding suitable p-type dopants, as well as reliable doping and characterization methods for the emerging wide bandgap semiconductor $\beta$-${\mathrm{Ga}_{2}\mathrm{O}_{3}}$ could strongly influence and contribute to the development of the next generation of power electronics. In this work, we combine easily accessible ion implantation, diffusion and nuclear transmutation methods to properly incorporate the Cd dopant into the $\beta$-${\mathrm{Ga}_{2}\mathrm{O}_{3}}$ lattice, being subsequently characterized at the atomic scale with the Perturbed Angular Correlation (PAC) technique and Density Functional Theory (DFT) simulations. [...]
2022 - 9 p.
- Published in : Sci. Rep. 12 (2022) 14584
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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.
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2022.
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Group Theory Analysis to Study Phase Transitions of Quasi-2D Sr$_{3}$Hf$_{2}$O$_{7}$
/ Lora da Silva, Estelina (Porto U.) ; Gerami, Adeleh Mokhles (IPM, Tehran ; CERN) ; Neenu Lekshmi, P (Porto U.) ; Marcondes, Michel L (Sao Paulo U.) ; Assali, Lucy V C (Sao Paulo U.) ; Petrilli, Helena M (Sao Paulo U.) ; Correia, Joao Guilherme (CERN ; Lisbon U.) ; Lopes, Armandina M L (Porto U.) ; Araújo, João P (Porto U.)
We present an $ab-initio$ study performed in the framework of density functional theory, group-subgroup symmetry analysis and lattice dynamics, to probe the octahedral distortions, which occur during the structural phase transitions of the quasi-2D layered perovskite Sr$_{3}$Hf$_{2}$O$_{7}$ compound. Such a system is characterized by a high-temperature I4/mmm centrosymmetric structure and a ground-state Cmc21 ferroelectric phase. [...]
2021 - 16 p.
- Published in : Nanomaterials 11 (2021) 897
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Quantum colour centers in diamond studied by emission channeling with short-lived isotopes (EC-SLI) and radiotracer photoluminescence
/ Pereira, Lino (KU Leuven, Quantum Solid State Physics (QSP), Belgium) ; Wahl, Ulrich (Instituto Superior Técnico, Universidade de Lisboa, Portugal) ; Correia, João Guilherme (Instituto Superior Técnico, Universidade de Lisboa, Portugal) ; Costa, Ângelo (CERN-TE, Geneva, Switzerland) ; David Bosne, Eric (Instituto Superior Técnico, Universidade de Lisboa, Portugal) ; Lima, Tiago (KU Leuven, Quantum Solid State Physics (QSP), Belgium) ; Moens, Janni (KU Leuven, Quantum Solid State Physics (QSP), Belgium) ; da Silva, Manuel (CICECO- Instituto de Materiais de Aveiro, Universidade de Aveiro, Portugal) ; Tunhuma, Malven (KU Leuven, Quantum Solid State Physics (QSP), Belgium) ; Vantomme, André (KU Leuven, Quantum Solid State Physics (QSP), Belgium) et al.
CERN-INTC-2020-037 ; INTC-P-562.
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2020.
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The peculiarities of reduction and doping of vanadium oxides probed by TDPAC spectroscopy at ISOLDE
/ Carbonari, Artur Wilson (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Saxena, Rajendra Narain (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Burimova, Anastasia (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Pereira, Luciano Fabricio Dias (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Sales, Tatiane da Silva Nascimento (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Leite Neto, Osmar Flávio da Silveira (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Genezini, Frederico Antonio (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Ribeiro Junior, Iberê Souza (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Bosch-Santos, Brianna (Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA) ; Correa, Eduardo Lima (Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA) et al.
CERN-INTC-2020-031 ; INTC-P-532-ADD-1.
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2020.
Fulltext - Original Document (INTC-P-532)
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