Laurent Binet
PSL Research University
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Publication
Featured researches published by Laurent Binet.
Journal of Applied Physics | 2018
Jean-Marc Costantini; Sandrine Miro; Nadia Touati; Laurent Binet; Gilles Wallez; Gérald Lelong; Maxime Guillaumet; William J. Weber
Micro-Raman spectroscopy, X-band electron paramagnetic resonance (EPR) spectroscopy, and UV-visible optical absorption spectroscopy were used to study the damage production in cerium dioxide (CeO2) single crystals by electron irradiation for three energies (1.0, 1.4, and 2.5u2009MeV). The Raman-active T2g peak was left unchanged after 2.5-MeV electron irradiation at a high fluence. This shows that no structural modifications occurred for the cubic fluorite structure. UV-visible optical absorption spectra exhibited a characteristic sub band-gap tail for 1.4-MeV and 2.5-MeV energies, but not for 1.0u2009MeV. Narrow EPR lines were recorded near liquid-helium temperature after 2.5-MeV electron irradiation; whereas no such signal was found for the virgin un-irradiated crystal or after 1.0-MeV irradiation for the same fluence. The angular variation of these lines in the {111} plane revealed a weak g-factor anisotropy assigned to Ce3+ ions (with the 4f1 configuration) in a high-symmetry local environment. It is conclude...
Philosophical Magazine | 2018
Jean-Marc Costantini; Nadia Touati; Laurent Binet; Gérald Lelong; Maxime Guillaumet; François Beuneu
Abstract The photo-annealing of colour centres in yttria-stabilised zirconia (YSZ) was studied by electron paramagnetic resonance spectroscopy upon UV-ray or laser light illumination, and compared to thermal annealing. Stable hole centres (HCs) were produced in as-grown YSZ single crystals by UV-ray irradiation at room temperature (RT). The HCs produced by 200-MeV Au ion irradiation, as well as the F+-type centres ( centres involving oxygen vacancies) were left unchanged upon UV illumination. In contrast, a significant photo-annealing of the latter point defects was achieved in 1.4-MeV electron-irradiated YSZ by 553-nm laser light irradiation at RT. Almost complete photo-bleaching was achieved by laser irradiation inside the absorption band of centres centred at a wavelength ~550 nm. Thermal annealing of these colour centres was also followed by UV–visible absorption spectroscopy showing full bleaching at 523 K. Colour-centre evolutions by photo-induced and thermally activated processes are discussed on the basis of charge exchange processes between point defects.
Archive | 2014
Didier Gourier; Laurent Binet; Hervé Vezin
Insoluble organic matter (IOM) conserved in ancient sedimentary rocks and in carbonaceous meteorites can reveal valuable information about the origin of Life on Earth and on the birth of the Solar System, respectively. These IOMs are also reference materials for the search for possible organic traces of extinct life on Mars. The combination of continuous-wave and pulsed EPR of the radicals in IOM provided several markers distinguishing these materials and related to their histories. For terrestrial IOM, the EPR linewidth of the radicals is mostly determined by unresolved 1H hyperfine interactions for IOM younger than 2500 million years (H-rich), and by dipolar interactions for older (H-depleted) IOM. The age of very primitive IOM could be estimated through the lineshape, which continuously evolves from Lorentzian to stretched Lorentzian upon ageing due to a change in the dimensionality of the radical spatial distribution. Nuclear spins within or near the radicals and the hyperfine interactions probed by pulsed EPR (through ESEEM and HYSCORE sequences) clearly distinguish meteoritic from terrestrial IOM. Radicals in meteorites are massively enriched in deuterium compared to terrestrial radicals, as a result of specific deuterium enrichment processes in the outer early Solar System. Meteoritic and terrestrial IOMs are also distinguished by the isotropic vs dipolar relative contributions in the 1H hyperfine interactions and by the 13C/1H HYSCORE signal ratio. Strong 31P and 14N HYSCORE signals were detected in terrestrial IOM, which point to possible P and N rich biological precursors. The spin states of the radicals could also be determined either indirectly from the temperature dependence of the EPR intensity or directly by transient nutation spectroscopy. Meteoritic IOM, in addition to S = 1/2 radicals, specifically contains species with either triplet ground state or thermally excited triplet states, which are lacking in terrestrial IOM.
Physical Chemistry Chemical Physics | 2017
Neelima Basavaraju; K. R. Priolkar; Aurélie Bessière; Suchinder K. Sharma; Didier Gourier; Laurent Binet; Bruno Viana; Shuichi Emura
Archive | 2002
Sylvie Derenne; Francois Robert; Laurent Binet; Didier Gourier; Jean Rouzaud; C. Largeau
Archive | 2004
Andrzej Skrzypczak; Sylvie Derenne; Francois Robert; Laurent Binet; Didier Gourier; Jean Rouzaud; Christian Clinard
Plasma Processes and Polymers | 2018
Mengxue Zhang; Stéphanie Ognier; Nadia Touati; Ines Hauner; Cédric Guyon; Laurent Binet; Michael Tatoulian
Archive | 2005
Yves Marrocchi; Francois Robert; Laurent Binet; Bernard Marty
Archive | 2007
O. Delpoux; Didier Gourier; Hervé Vezin; Laurent Binet; Sylvie Derenne; Francois Robert
Archive | 2003
Andrzej Skrzypczak; Laurent Binet; Didier Gourier; Sylvie Derenne; Francois Robert