Emission Channeling with Short-Lived Isotopes (EC-SLI) at CERN's ISOLDE Facility

Wahl, Ulrich; Correia, J. G.; Costa, A. R. G.; David-Bosne, E.; Pereira, L. M. C.; Amorim, lmarina Pinto de Almeida; Augustyns, V.; Temst, Kristiaan; Vantomme, André; Silva, M. R. da; Silva, D. J.; Araújo, João P.; Miranda, P.; Bharuth‐Ram, K.

doi:10.1142/9789814632041_0061

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…In the case of Mg, we used the short-lived 27 Mg (t 1/2 = 9.45 min), which was produced at CERN's ISOLDE on-line isotope separator facility by means of bombarding Ti targets with 1.4 GeV protons, followed by out-diffusion, resonant laser ionization and mass separation. More experimental details regarding EC experiments with 27 Mg can be found in refs 32,33 and in the Supporting Information. The major lattice sites can be identified by fitting the experimentally observed emission yields by linear combinations of theoretical patterns 28,29,34 calculated for specific positions of the emitter atoms in the lattice.…”

Section: Resultsmentioning

confidence: 99%

Magnesium-Vacancy Optical Centers in Diamond

et al. 2022

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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. A smaller fraction of Mg atoms (∼13 to 17%) was found on substitutional sites. The photoluminescence emission was investigated both at the ensemble and individual defect level in the 5–300 K temperature range, offering a detailed picture of the MgV-related emission properties and revealing the occurrence of previously unreported spectral features. The optical excitability of the MgV center was also studied as a function of the optical excitation wavelength to identify the optimal conditions for photostable and intense emission. The results are discussed in the context of the preliminary experimental data and the theoretical models available in the literature, with appealing perspectives for the utilization of the tunable properties of the MgV center for quantum information processing applications.

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Section: Resultsmentioning

confidence: 99%

Magnesium-Vacancy Optical Centers in Diamond

et al. 2022

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“…An example outside the field of RBS/C but where routinely 2D channeling patterns from PSDs are used, and which motivated the work presented here, are emission channeling (EC) lattice location studies. EC uses implanted radioactive isotopes and the channeling effects are measured from the charged particles emitted during nuclear decay [33][34][35][36][37]. Most commonly β − particles or conversion electrons (CEs) are used due to the wide choice of suited isotopes but applying α [35,38] or β + emitters [33] is also possible.…”

Section: Motivation: the Use Of Two-dimensional Patterns In Channeling Measurementsmentioning

confidence: 99%

A generalized fitting tool for analysis of two-dimensional channeling patterns

David-Bosne

Wahl

Correia

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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The acquisition of two-dimensional (2D) channeling patterns is gaining increased popularity within the ion beam community. However, with the exception of emission channeling experiments for the lattice location of radioactive impurities, quantitative analysis of such patterns is rarely found. We present a general description of the statistical data analysis methodology for 2D channeling patterns, which consists of comparing experimental data by means of a fit procedure to theoretical yield distributions. The developed software allows for chi-square or maximum likelihood-based fits, optimizing the orientation of the theoretical vs the experimental pattern, as well as the best choice of random level, and providing fractions for the contributions from several theoretical patterns related to different lattice sites. Optionally also the angular resolution can be used as a fit parameter. Use of the software is illustrated by examples of electron emission channeling from 27 Mg in GaN, as well as 4 He RBS channeling from Ge.

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Emission Channeling with Short-Lived Isotopes (EC-SLI) at CERN's ISOLDE Facility

Cited by 2 publications

References 27 publications

Magnesium-Vacancy Optical Centers in Diamond

Magnesium-Vacancy Optical Centers in Diamond

A generalized fitting tool for analysis of two-dimensional channeling patterns

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