Loginov Evgeniy, Drabbels Marcel
Laboratoire de Chimie Physique Moléculaire, Ecole Polytechnique Fédéral de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
J Phys Chem A. 2007 Aug 9;111(31):7504-15. doi: 10.1021/jp0716278. Epub 2007 Jun 15.
The excited state dynamics of silver atoms embedded in helium nanodroplets have been investigated by a variety of spectroscopic techniques. The experiments reveal that 5p 2P1/2 <-- 5s 2S1/2 excitation of embedded silver atoms results almost exclusively in the ejection of silver atoms populating the 2P1/2 state. In contrast, excitation to the 5p 2P3/2 state leads to the ejection of not only silver atoms in the 2P1/2, 2P3/2, and 2D5/2 excited states but also of AgHe and AgHe2. These AgHe exciplexes are mainly formed in the A2Pi1/2 electronic state. In addition, it is found that a considerable fraction of the 2P3/2 excited silver atoms become solvated within the helium droplets, most probably as AgHe2. The observations can be accounted for by a model in which the metastable 2D5/2 state of silver acts as a doorway state in the relaxation of 2P3/2 excited silver atoms.
通过多种光谱技术研究了嵌入氦纳米液滴中的银原子的激发态动力学。实验表明，嵌入银原子的5p 2P1/2 ←-- 5s 2S1/2激发几乎完全导致处于2P1/2态的银原子的喷射。相比之下，激发到5p 2P3/2态不仅会导致处于2P1/2、2P3/2和2D5/2激发态的银原子的喷射，还会导致AgHe和AgHe2的喷射。这些AgHe激基复合物主要在A2Pi1/2电子态中形成。此外，发现相当一部分处于2P3/2激发态的银原子在氦液滴中被溶剂化，很可能是形成了AgHe2。这些观察结果可以用一个模型来解释，在该模型中，银的亚稳态2D5/2态在2P3/2激发态银原子的弛豫过程中充当门道态。
