Evidences of the participation of excited states in the positronium formation mechanism in Sm1- xEux(dpm)3 and Gd1- xEux(dpm)3 solid solutions
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2019-12-27
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Fulgêncio, Fernando
Sábio, Rafael [UNESP]
Ribeiro, Sidney. J. [UNESP]
Oliveira, Fernando C.
Borges, Alex S.
Araujo, Maria H.
Windmöller, Dario
Marques-Netto, Antônio
Machado, José C.
Magalhães, Welington F.
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Positron annihilation lifetime (PALS) and optical spectroscopies measurements were performed in Sm3+, Eu3+ and Gd3+ dipivaloylmethanate complexes, Ln(dpm)3 (dpm = 2,2,6,6-tetramethyl-3,5-pentanedionate), and also on their binary solid solutions of general formula Ln1-xEux(dpm)3, where Ln = Sm3+ or Gd3+. The results indicate that photophysical processes present in the solid solutions, such as a ligand-to-metal charge transfer (LMCT), and Sm3+ ? Eu3+ energy transfers, are strongly related to the positronium (Ps) formation probability. The results were interpreted from a kinetic model involving the participation of excited states in the Ps formation that we are calling correlated cybotactic system kinetic mechanism (CCSKM).
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AIP Conference Proceedings, v. 2182.