Site-selected luminescence of atomic europium in the solid rare gases.
Site-selected luminescence of atomic europium in the solid rare gases.
复制标题
固体稀有气体中铕原子的选点发光。
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
用位置选择性激发简化了分离于固体稀有气体中的Eu原子在可见光谱区的复杂发射。除了y(8)P共振荧光外，y(8)P态的激发还产生来自z(6)P态和亚稳态a(10)D态的发射。在690 nm处的很弱发射被暂时归属于z(10)P态的J=9/2能级。分离在红色和蓝色位置的Eu原子在光谱和时间上表现出非常不同的温度依赖关系。对于y(8)P态的发射，红位原子表现出较小的斯托克斯位移和产生的辐射寿命，而蓝位原子的发射失去强度，时间分布在10-16K之间急剧缩短，表明该位点的非辐射弛豫非常有效。对每个位置的y(8)P态所表现出的斯托克斯位移的分析支持了先前发表的[O.Byrne和J.G.McCaffrey，J.Chem]中的归属。太棒了。134,124501(2011年)]较小的蓝色四空位与客人有更大的排斥性相互作用。除了y(8)P态共振荧光外，所有其他发射的记录衰变曲线都显示出多个分量。这种行为归因于多个晶场能级的存在，这些能级是由产生发射的不同自旋轨道能级的分裂引起的。
Site-selective excitation has been used to simplify complex emission recorded in the visible spectral region for atomic europium isolated in the solid rare gases. In addition to y(8)P resonance fluorescence, excitation of the y(8)P state produces emission from the z(6)P state and the metastable a(10)D state. Very weak emission at 690 nm is tentatively assigned to the J = 9/2 level of the z(10)P state. Eu atoms isolated in the red and blue sites exhibit very different temperature dependence both spectrally and temporally. For the y(8)P state emission the red site atoms exhibit small Stokes shifts and yield radiative lifetimes while the emission from the blue site loses intensity and the temporal profiles shorten dramatically between 10 and 16 K indicating very efficient non-radiative relaxation in this site. An analysis of the Stokes shifts exhibited for the y(8)P state in each site supports the attributions made in a previous publication [O. Byrne and J.G. McCaffrey, J. Chem. Phys. 134, 124501 (2011)] that the smaller blue tetravacancy site has a greater repulsive interaction with the guest. With the exception of the y(8)P state resonance fluorescence, the recorded decay profiles of all the other emissions exhibit multiple components. This behaviour has been attributed to the existence of multiple crystal field levels arising from the splitting of the distinct spin-orbit levels from which emission occurs.