Local lattice relaxation around Tl substitutional impurities in a NaI(Tl) scintillator crystal
Artikel i vetenskaplig tidskrift, 2020

A Thallium (Tl) L3-edge x-ray absorption experiment was performed on a NaI(Tl) scintillation crystal at room temperature using fluorescence detection. The data analysis provides clear evidence for a ≃5 % average bond length expansion of the first shell I atoms surrounding the Tl impurities with respect to the Na-I crystallographic bond-length. Possible evidence for a slight expansion of the second and third shells is obtained. The data are compatible with a previous experiment performed at liquid nitrogen temperature considering thermal expansion. A critical review of existing theoretical predictions and density functional theory supercell calculations support present findings and suggest the opportunity to perform a high quality temperature dependent experiment.

XAFS

Impurity site

NaI(Tl)

Scintillator crystal

Författare

A. Filipponi

Laboratori Nazionali del Gran Sasso

Universita degli Studi dell'Aquila

G. Profeta

Universita degli Studi dell'Aquila

Laboratori Nazionali del Gran Sasso

N. Di Marco

Laboratori Nazionali del Gran Sasso

Gran Sasso Science Institute (GSSI)

Vanessa Zema

Gran Sasso Science Institute (GSSI)

Chalmers, Fysik, Subatomär fysik och plasmafysik

K. Schäffner

Max-Planck-Gesellschaft

F. Reindl

Osterreichische Akademie Der Wissenschaften

Atominstitut der Osterreichischen Universitaten

Messaoud Harfouche

Next to Princess Rahma University College

A. Trapananti

Istituto Nazionale di Fisica Nucleare

Universita degli Studi di Camerino

A. Di Cicco

Istituto Nazionale di Fisica Nucleare

Universita degli Studi di Camerino

Radiation Physics and Chemistry

0969-806X (ISSN)

Vol. 177 108992

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1016/j.radphyschem.2020.108992

Mer information

Senast uppdaterat

2020-10-12