Transient absorption spectra and relaxation kinetics in Nb-doped PbWO4 scintillating crystals

6533b81ffe1ef96bd12783d5

RESEARCH PRODUCT

Transient absorption spectra and relaxation kinetics in Nb-doped PbWO4 scintillating crystals

Donāts Millers Larisa Grigorjeva Vladimir Pankratov S. Chernov

subject

Crystallography Radiation Absorption spectroscopy Chemistry Kinetics Ultrafast laser spectroscopy Doping Relaxation (physics)Irradiation Absorption (electromagnetic radiation)Instrumentation Molecular physics Recombination

description

Abstract The spectra and relaxation kinetics of absorption induced by a pulsed electron beam were studied for undoped and Nb-doped PbWO 4 single crystals. A significant influence of Nb doping on transient absorption was found. The influence of Nb doping on the relaxation kinetics is proposed to be due to an oxygen vacancy involving electron–hole recombination. A delay was observed (35– 50 ns ) between the growth of F-centers and the irradiation pulse. A large portion of the F-centers decays within ∼16 μs due to recombination with mobile holes. The prolonged recombination processes are responsible for the decrease of the scintillation yield in PbWO 4 : Nb crystals.

year	journal	country	edition	language
2001-10-01	Radiation Measurements

https://doi.org/10.1016/s1350-4487(01)00079-8

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