Eu/RG absorption and excitation spectroscopy in the solid rare gases: state dependence of crystal field splitting and Jahn-Teller coupling.
Eu/RG absorption and excitation spectroscopy in the solid rare gases: state dependence of crystal field splitting and Jahn-Teller coupling.
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固体稀有气体中的 Eu/RG 吸收和激发光谱：晶体场分裂和 Jahn-Teller 耦合的状态依赖性。
DOI：
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发表时间：
2011
影响因子：
4.4
通讯作者：
J. McCaffrey
中科院分区：
文献类型：
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作者：
Owen Byrne;J. McCaffrey
对基体隔离原子铕的退火样品记录的吸收光谱显示，Ar 和 Kr 中存在一对热稳定位点，而 Xe 中存在单个位点。可见 s→p 能带的矩阵位移与主体极化率的关系图允许 Xe 中的单个位点与 Ar 和 Kr 中的蓝色位点关联。基于Eu-稀有气体（RG）双原子和已知的Na-RG分子预期的相似基态键长，蓝色位点归因于较小的四空位中的Eu占据，而红色位点被认为来自六空位位点。两个位点均具有立方对称性，与所研究的三个宿主中这些带的 y(8)P ← a(8)S(7/2) 跃迁上存在的明显 Jahn-Teller 结构一致。位点选择性激发光谱已被用来重新分析 Jakob 等人先前发表的复杂吸收光谱。 [物理。莱特。 A 57, 67 (1976)] 用于近紫外 f → d 跃迁。基于固体氩中存在一对热稳定位点，当（8）P态的J≥5/2能级被隔离在这两个具有立方对称性的位点时，已经确定会发生晶体场分裂。通过详细的线形分析，发现Ar中J = 5/2水平上红色和蓝色位点的晶体场分裂幅度分别为105和123 cm(-1)。
Absorption spectroscopy recorded for annealed samples of matrix-isolated atomic europium reveals a pair of thermally stable sites in Ar and Kr while a single site exists in Xe. Plots of the matrix shifts of the visible s → p bands versus host polarizability, allowed the association of the single site in Xe and the blue sites in Ar and Kr. On the basis of the similar ground state bond lengths expected for the Eu-rare gas (RG) diatomics and the known Na-RG molecules, the blue sites are attributed to Eu occupancy in the smaller tetra-vacancy while the red sites are proposed to arise from hexa-vacancy sites. Both sites are of cubic symmetry, consistent with the pronounced Jahn-Teller structure present on the y(8)P ← a(8)S(7/2) transition for these bands in the three hosts studied. Site-selective excitation spectroscopy has been used to reanalyze complex absorption spectra previously published by Jakob et al. [Phys. Lett. A 57, 67 (1976)] for the near-UV f → d transitions. On the basis that a pair of thermally stable sites exist in solid argon, the occurrence of crystal field splitting has been identified to occur for the J ≥ 5/2 level of the (8)P state when isolated in these two sites with cubic symmetry. From a detailed lineshape analysis, the magnitude of the crystal field splittings on the J = 5/2 level in Ar is found to be 105 and 123 cm(-1) for the red and blue sites, respectively.