Many‐Body Processes in Nonradiative Energy Transfer between Ions in Crystals
Many‐Body Processes in Nonradiative Energy Transfer between Ions in Crystals
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DOI：
10.1063/1.1677621
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发表时间：
1972-03
影响因子：
4.4
通讯作者：
F. K. Fong;D. J. Diestler
中科院分区：
文献类型：
--
作者：
F. K. Fong;D. J. Diestler
结果表明，多体相互作用在晶体中离子间的非辐射能量传递过程中起主导作用。这些相互作用正式地产生于施主离子的电子与两个或多个受主离子之间的库仑和交换相互作用。特别详细地讨论了偶极-偶极微扰哈密顿量通过虚跃迁产生的三体转移过程。在浓度猝灭和敏化发光实验中观察到的每离子非辐射能量转移率的二次浓度依赖关系表明了这一过程。在稀土离子中，多体相互作用是重要的，因为4fn晶态的宽度很窄，并且涉及相反宇称的4fn−15d态的虚跃迁的大力矩。
It is shown that many‐body interactions can play a dominant role in nonradiative energy transfer processes between ions in crystals. These interactions formally arise from the Coulomb and exchange interactions between the electrons of the donor ion and two or more acceptor ions. In particular, three‐body transfer processes arising from the dipole‐dipole perturbation Hamiltonian through virtual transitions are considered in some detail. Such processes are manifested by the quadratic concentration dependence of the per‐ion nonradiative energy transfer rate observed in concentration quenching and sensitized luminescence experiments. Many‐body interactions are important in rare‐earth ions because of the narrow widths of the 4fn crystal states and because of the large moments of the virtual transitions involving the opposite parity 4fn−1 5d states.