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Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr3, BaI2, and SrI2

André Schleife ; Xiao Zhang ; Qi Li ; Paul Erhart (Institutionen för fysik, Material- och ytteori (Chalmers)) ; Daniel Åberg
Journal of Materials Research (08842914). Vol. 32 (2017), 1, p. 56-63.
[Artikel, refereegranskad vetenskaplig]

Materials for scintillator radiation detectors need to fulfill a diverse set of requirements such as radiation hardness and highly specific response to incoming radiation, rendering them a target of current materials design efforts. Even though they are amenable to cutting-edge theoretical spectroscopy techniques, surprisingly many fundamental properties of scintillator materials are still unknown or not well explored. In this work, we use first-principles approaches to thoroughly study the optical properties of four scintillator materials: NaI, LaBr3, BaI2, and SrI2. By solving the Bethe-Salpeter equation for the optical polarization function we study the influence of excitonic effects on dielectric and electron-energy loss functions. This work sheds light into fundamental optical properties of these four scintillator materials and lays the ground-work for future work that is geared toward accurate modeling and computational materials design of advanced radiation detectors with unprecedented energy resolution. Copyright © Materials Research Society 2016.

Nyckelord: electron energy loss spectroscopy (EELS)NiAl; electronic structure; optical properties



Denna post skapades 2017-03-16. Senast ändrad 2017-03-22.
CPL Pubid: 248590

 

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Institutioner (Chalmers)

Institutionen för fysik, Material- och ytteori (Chalmers)

Ämnesområden

Hållbar utveckling
Fysik

Chalmers infrastruktur