Metastable Aluminum Atoms Floating on the Surface of Helium Nanodroplets.
Metastable Aluminum Atoms Floating on the Surface of Helium Nanodroplets.
复制标题
漂浮在氦纳米液滴表面的亚稳态铝原子。
DOI：
10.1103/physrevlett.114.233401
复制
发表时间：
2015
影响因子：
8.6
通讯作者：
Jeffs J
中科院分区：
文献类型：
--
作者：
Jeffs J
金属原子已被证明是超流氦纳米液滴性质的灵敏探针。迄今为止，所有关于氦滴掺杂的实验都集中在金属原子在其基态电子态的附着上。在这里，我们报告的第一个例子，金属原子在激发态成为连接到氦纳米液滴。所讨论的原子是铝，它们是通过激光烧蚀以亚稳四重态产生的，它附着并保留在氦滴的表面。表面位置的证据来自电子光谱，其中包括非常窄的吸收曲线，显示非常小的光谱位移。支持ab initiocalculations表明，有一个亚稳态铝原子的能量激励，以保持在表面上的氦液滴，而不是移动到内部。结果表明，氦液滴可能提供了一种捕获和传输亚稳态激发原子和分子物种的方法。
Metal atoms have proved to be sensitive probes of the properties of superfluid helium nanodroplets. To date, all experiments on the doping of helium droplets have concentrated on the attachment of metal atoms in their ground electronic states. Here we report the first examples of metal atoms in excited states becoming attached to helium nanodroplets. The atoms in question are aluminum, and they have been generated by laser ablation in a metastable quartet state, which attaches to and remains on the surface of helium droplets. Evidence for a surface location comes from electronic spectra, which consist of very narrow absorption profiles that show very small spectral shifts. Supportingab initiocalculations show there to be an energy incentive for a metastable Al atom to remain on the surface of a helium droplet rather than move to the interior. The results suggest that helium droplets may provide a method for the capture and transport of metastable excited atomic and molecular species.