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首页> 外文会议>Positron and positronium chemistry X >Evidence of the participation of electronic excited states in the mechanism of positronium formation in substitutional Tb_(1-x)Eu_x(dpm)3 solid solutions studied by optical and positron annihilation spectroscopies
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Evidence of the participation of electronic excited states in the mechanism of positronium formation in substitutional Tb_(1-x)Eu_x(dpm)3 solid solutions studied by optical and positron annihilation spectroscopies

机译：通过光学和正电子an没光谱研究了取代的Tb_（1-x）Eu_x（dpm）3固溶体中电子激发态参与正电子形成机理的证据

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摘要

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-x)Eu_x(dpm)_3. A correlation between the ~5D_4 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.
机译：在Tb（Ⅲ）和Eu（Ⅲ）二新戊酰甲烷酸酯，Tb（dpm）_3和Eu（dpm）_3以及它们的通式Tb_（1-的二元固溶体）中进行正电子ni没寿命（PALS）和光致发光光谱测量x）Eu_x（dpm）_3。观察到〜5D_4 Tb（Ⅲ）能级寿命与形成概率之间的相关性，表明配体-金属电荷转移LMCT状态在发光猝灭和抑制formation形成中均起作用。从这些结果，提出了一个新的模型，表明激发的电子态在正电子的形成机理中具有重要作用。

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  • 来源
  • 会议地点 Smolenice Castle(SK)
  • 作者

    Welington F. Magalhaes; Fernando Fulgencio; F. C. de Oliveira; Dario Windmoeller; Jose C. Machado; H. F. Brito; O. L. Malta; G. F. de Sa;

  • 作者单位

    Departamento de Quimica, ICEx Universidade Federal de Minas Gerais - UFMG, C. P. 702, CEP 31270-901 Belo Horizonte, MG, Brazil;

    Departamento de Quimica, ICEx Universidade Federal de Minas Gerais - UFMG, C. P. 702, CEP 31270-901 Belo Horizonte, MG, Brazil;

    Departamento de Quimica, ICEx Universidade Federal de Minas Gerais - UFMG, C. P. 702, CEP 31270-901 Belo Horizonte, MG, Brazil,Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET-MG), Campus VII, Timoteo, MG, Brazil;

    Departamento de Quimica, ICEx Universidade Federal de Minas Gerais - UFMG, C. P. 702, CEP 31270-901 Belo Horizonte, MG, Brazil;

    Departamento de Quimica, ICEx Universidade Federal de Minas Gerais - UFMG, C. P. 702, CEP 31270-901 Belo Horizonte, MG, Brazil;

    Instituto de Quimica, Universidade de Sao Paulo, CEP 05508-900, Sao Paulo, SP, Brazil;

    Departamento de Quimica Fundamental, CCEN, UFPE, CEP 50670-901 Recife, PE, Brazil;

    Departamento de Quimica Fundamental, CCEN, UFPE, CEP 50670-901 Recife, PE, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Positron annihilation spectroscopy; Positronium formation mechanism; Photoluminescence spectroscopy; Molecular solid solutions; Dipivaloylmethanates complexes;

    机译：正电子an没光谱法；正电子的形成机理；光致发光光谱法；分子固溶体；二甲戊酰甲烷酸酯复合物;

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