Institute of Physics, University of Tartu, Tartu, Estonia.
J Phys Condens Matter. 2010 Sep 22;22(37):375505. doi: 10.1088/0953-8984/22/37/375505. Epub 2010 Aug 31.
We carried out a combined study of UV-VUV luminescence and resonant x-ray emission from BeO single crystals with incident photon energies in the vicinity of the Be 1s absorption edge. The x-ray emission spectra show that at the Be 1s photoabsorption edge the lattice relaxation processes in the excitation site take place already on the timescale of the radiative decay of the core excitation. Comparison of the x-ray emission and the luminescence spectra indicates that the maximum energy loss of the process of lattice relaxation during the decay of inner-shell holes is similar to the loss that occurs in the self-trapping process of valence excitons. The possible decay channels of core excitations have been discussed and the mechanism for the creation of 5.2 eV luminescence at the photoabsorption resonances has been suggested.
我们进行了一项联合研究，研究了 BeO 单晶体的紫外-真空紫外发光和共振 X 射线发射，入射光子能量接近 Be 1s 吸收边缘。X 射线发射光谱表明，在 Be 1s 光吸收边缘，激发点的晶格弛豫过程已经在核心激发的辐射衰变时间尺度上发生。X 射线发射光谱和发光光谱的比较表明，内壳孔衰变过程中晶格弛豫的最大能量损失与价激子自陷过程中的损失相似。讨论了核心激发的可能衰减通道，并提出了在光吸收共振处产生 5.2 eV 发光的机制。
