Spectroscopy of silver dimers in triplet states
Spectroscopy of silver dimers in triplet states
复制标题
三重态银二聚体的光谱
DOI：
10.1088/0953-4075/39/19/s25
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
J. Tiggesbäumker
中科院分区：
文献类型：
--
作者：
A. Przystawik;P. Radcliffe;S. Göde;K. Meiwes;J. Tiggesbäumker
嵌入在超冷氦纳米液滴中的银二聚体通过从3.85 eV到4.1 eV的强共振被双光子激发电离。相应的光电子能谱表明，与气相相比，电离阈值向较低的值移动了1.4 eV以上。这给出了强有力的证据，表明存在处于最低三重态的弱结合二聚体，从而使三重态AG2的光谱变得方便。通过与理论预测的比较，可以指定光谱中的结构。成功地鉴定了嵌入在氦滴中的三重态银二聚体，这一范例表明，这种弱结合体系的形成不像碱那样局限于表面位置，而是代表了超冷氦滴环境的一般特征。
Silver dimers embedded in ultracold helium nanodroplets are ionized by two-photon excitation via a strong resonance which extends from 3.85 eV up to 4.1 eV. The corresponding photoelectron spectra reveal that the ionization threshold is shifted by more than 1.4 eV towards lower values when compared to the gas phase. This gives strong evidence that weakly bound dimers in the lowest lying triplet state are present, thus enabling convenient spectroscopy of the triplet Ag2. A comparison with predictions from theory allows an assignment of the structure in the spectra. The successful identification of triplet silver dimers embedded in helium droplets shows exemplarily that the formation of such weakly bound systems is not restricted to surface locations as with the alkalis, but represents a general feature of the ultracold helium droplet environment.