Evidence of the Participation of Electronic Excited States in the Mechanism of Positronium Formation in Substitutional Tb1-xEux(dpm)3 Solid Solutions Studied by Optical and Positron Annihilation Spectroscopies

Author:

Magalhães Welington F.1,Fulgêncio Fernando1,de Oliveira Fernando C.1,Windmöller Dario1,Machado José C.1,Brito Hermi F.2,Malta Oscar L.3,de Sá Gilberto F.3

Affiliation:

1. ICEx Universidade Federal de Minas Gerais

2. Universidade de São Paulo - USP

3. Universidade Federal de Pernambuco - UFPE

Abstract

Positron annihilation lifetime (PALS) and photoluminescence spectroscopies measurements were performed in Tb(III) and Eu(III) dipivaloylmethanates, Tb(dpm)3and Eu(dpm)3, and also on their binary solid solutions of general formula Tb1-xEux(dpm)3. A correlation between the5D4Tb(III) energy level lifetime and the positronium formation probability was observed, indicating that the ligand-to-metal charge transfer LMCT states act in both luminescence quenching and positronium formation inhibition. From these results, a new model is proposed, showing that excited electronic states have a relevant role in the positronium formation mechanism.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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