Electronic structure and luminescence of CsI : Na
نویسنده
چکیده
Calculations are performed on several aspects of the luminescence of pure CsI and CsI: Na. These include electronic-structure calculations by both pseudopotential and semiempirical molecular-orbital methods, as well as lattice-configuration studies. The results suggest that the main observed emission in CsI: Na at 2.95 eV involves the recombination of a self-trapped exciton immediately adjacent to the substitutional Na impurity.
منابع مشابه
Growth of CsI(Tl) crystals doped with Ca and Tm and investigation of its scintillation characteristics
In this work, the growth of CsI(Tl) crystals as gamma detector was performed using vertical Bridgman method with Ca and Tm co-dopants. For evaluation of the growth crystals, X-Ray Diffraction (XRD), photoluminescence and thermoluminescence spectra as well as recorded gamma spectra were employed. In addition, the scintillation properties including energy resolution, scintillation decay time, abs...
متن کاملF centre production in CsI and CsI ± Tl crystals under Kr ion irradiation at 15
We present results of simultaneous in situ luminescence and optical absorption studies in scintillator CsI and CsI±Tl crystals, exposed to very dense electronic excitations induced by Kr ions (8.63 MeV/amu). Irradiation at 15 K leads to the formation of the prominent F absorption band. In addition, several other features of the broad absorption between exciton and F bands were ascribed to an an...
متن کاملThe Fabrication of Scintillator Column by Hydraulic Pressure Injection Method
Cesiumiodide with Na doping (CsI(Na)) solution or melt is easily forming threedimension dendrites on the free surface. The defects or bobbles form inside the CsI(Na) during the solution or melt solidification. The defects or bobbles can further effect the x-ray path in the CsI(Na) crystal and decrease the scintillation characteristics of CsI(Na). In order to enhance the CsI(Na) scintillated pro...
متن کاملبررسی ویژگیهای شیوههای رایج دزیمتری گذشته نگر
As public concern mounts over exposures to ionizing radiation stemming from environmental releases of radionuclides following nuclear accidents, there is a growing need to develop reliable techniques that reconstruct exposures and doses to individuals. Especially in situations where conventional dosimeters were not in place at the time of facing to radiation exposure. In order to provide guidan...
متن کاملDevelopment of crystals based on cesium iodide for measurements of gamma radiation and alpha particles*
In recent years, the search for new scintillators has renewed, increasing the needs for the development of high-energy physics, nuclear tomography and other fields of science and engineering. For high energy particle accelerators, it is common the use of multiple detectors capable of working under high counting rates, requiring detectors with short decay time (about 10 ns) and high density [3, ...
متن کامل