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

Welington F. Magalhães; Fernando Fulgêncio; Fernando C. de Oliveira; Dario Windmöller; José C. Machado; Hermi F. Brito; Oscar L. Malta; Gilberto F. de Sá

doi:10.4028/www.scientific.net/MSF.733.245

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HomeMaterials Science ForumMaterials Science Forum Vol. 733Evidence of the Participation of Electronic...

Evidence of the Participation of Electronic Excited States in the Mechanism of Positronium Formation in Substitutional Tb_1-xEu_x(dpm)₃ Solid Solutions Studied by Optical and Positron Annihilation Spectroscopies

Abstract:

Positron annihilation lifetime (PALS) and photoluminescence spectroscopies measurements were performed in Tb(III) and Eu(III) dipivaloylmethanates, Tb(dpm)₃ and Eu(dpm)₃, and also on their binary solid solutions of general formula Tb_1-xEu_x(dpm)₃. A correlation between the ⁵D₄ Tb(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.

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Periodical:

Materials Science Forum (Volume 733)

Pages:

245-248

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.733.245

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Online since:

November 2012

Authors:

Welington F. Magalhães, Fernando Fulgêncio, Fernando C. de Oliveira, Dario Windmöller, José C. Machado, Hermi F. Brito, Oscar L. Malta, Gilberto F. de Sá

Keywords:

Dipivaloylmethanates Complexes, Molecular Solid Solutions, Photoluminescence Spectroscopy, Positron Annihilation Spectroscopy, Positronium Formation Mechanism

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