Regensburg 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 46: Optical Properties

HL 46.10: Talk

Thursday, March 20, 2025, 12:30–12:45, H15

Theoretical and Experimental Study of Lead Tungstate (PWO-II) Crystal Properties for Electromagnetic Calorimetry — •Ather Ahmad¹, Pavel Orsich¹, Valera Dormenev¹, Hans-Georg Zaunick¹, Kai-Thomas Brinkmann¹, Simone Sanna², Martin Becker³, and Limei Chen³ — ¹II. Physikalisches Institut, Gießen, Germany — ²Institut für Theoretische Physik, Gießen, Germany — ³I. Physikalisches Institut, Gießen, Germany

Lead tungstate (PbWO₄ or PWO) is widely recognized as a high-performance scintillator for electromagnetic calorimeters due to its fast response, high density, and radiation hardness. PWO scintillator material is used in several experiments, such as CMS at the LHC (CERN), and the next-generation PWO-II crystals, which are doped to enhance their properties, have been optimized for the PANDA experiment at FAIR in Darmstadt.

To gain a deeper understanding of the material’s performance, we have combined theoretical and experimental approaches to study the electronic and optical properties of PWO-II. Raman spectra and light transmission measurements were conducted on PWO-II samples and compared with results from density functional theory (DFT) calculations. In our models, we consider the crystal phases stable at room temperature, revealing characteristic differences in both Raman spectra and light transmission between these phases.

These combined efforts aim to refine the characterization of PWO-II and support the development of advanced calorimeter materials.

Keywords: PWO-II; Raman; DFT; Light Transmission; Defects