Emission de bandes larges dans ZnSe : cathodoluminescence, thermoluminescence, transitions dues aux centres profonds

In this paper we study the thermal behaviour of the broad band emissions from impurity-doped and self-activated ZnSe cubic crystals. The copper red band (1.96 eV) is broadened chiefly on the low energy side when the temperature is increased while the green band (2.33 eV) vanishes near room temperature. Activation energies for thermal quenching are derived. We also study trap depths and recombination kinetics by various thermoluminescence techniques. Very low values ∼ 10 4 s-1 of the frequency factor are found for shallow traps although move typical values are obtained for the deepest traps. Retrapping phenomena are described. It was not possible to determine exact values for the trap depths of the emitting levels, although energy intervals in which these depths lie are given.Dans cet article nous étudions le comportement thermique des émissions de bandes larges sur des cristaux de ZnSe cubique dopés et self-activés. La bande rouge du cuivre (1,96 eV) s'élargit principalement du côté des basses énergies quand la température croît et la bande verte (2,33 eV) disparaît aux environs de la température ordinaire. Nous obtenons les énergies d'activation thermique. Nous étudions aussi les profondeurs des pièges par différentes techniques de thermoluminescence ainsi que les cinétiques de recombinaison. Des valeurs très faibles ∼ 104 s-1 du facteur de fréquence sont trouvées pour les pièges peu profonds, alors qu'elles sont normales pour les pièges profonds. Un phénomène de recapture est décrit. Il n'est pas possible de déterminer exactement les profondeurs des niveaux émetteurs, mais on peut fixer leur profondeur dans un intervalle d'énergie

How to perform subperichondrial and subperiosteal rhinoplasty

International audienc

Toward a Virtual Observatory for Solar System Plasmas: an exceptional scientific opportunity

International audienc

Toward a Virtual Observatory for Solar System Plasmas: an exceptional scientific opportunity

International audienc

Toward a Virtual Observatory for Solar System Plasmas: an exceptional scientific opportunity

International audienc

Connecting the CDPP/AMDA service to planetary plasma data: Venus, Earth, Mars, Saturn (Jupiter and comets)

International audienceThese last years, CDPP has developed a new service, AMDA (Automated Multi-Dataset Analysis), which is a web-based facility for on line analysis of space physics data (magnetospheric, heliospheric, planetary plasmas) coming from either its local database or distant ones. This tool allows the user to perform on line classical manipulations such as data visualization, parameter computation or data extraction. AMDA also offers innovative functionalities such as event search on the content of the data in either visual or automated way. AMDA has been recently integrated as a service to the scientific community for the Plasma Physics thematic node of the EuroPlaNet IDIS (Integrated and Distributed Information Service) activities. We will present the service AMDA and the planetary plasma data accessible via the service. We will then illustrate some of its applications (boundary identification and planetary space weather) for the comparative analysis of the planetary ionized environments. We will finally discuss future developments under study at CDPP to integrate with AMDA new datasets (Jupiter, comets) and new (astronomical) tools