Physikalisches Institut, Universität Freiburg, Freiburg, Germany.
Phys Chem Chem Phys. 2012 Mar 21;14(11):3843-51. doi: 10.1039/c2cp22749e. Epub 2012 Feb 13.
Highly excited states of rubidium (Rb) atoms attached to helium (He) nanodroplets are studied by two-photon ionization spectroscopy in combination with electron and ion imaging. We find high yields of RbHe and RbHe(2) exciplexes when exciting to the 4D and 6P bands but not at the 6S band, in accord with a direct formation of exciplexes in binding RbHe pair potentials. Photoion spectra and angular distributions are in good agreement with a pseudodiatomic model for the RbHe(N) complex. Repulsive interactions in the excited states entail fast dissociation followed by ionization of free Rb atoms as well as of RbHe and RbHe(2) exciplexes.
通过结合电子和离子成像的双光子电离光谱学研究了附着在氦（He）纳米液滴上的铷（Rb）原子的高激发态。当激发到 4D 和 6P 带时，我们发现 RbHe 和 RbHe(2) 复合物的产率很高，但在 6S 带时则没有，这与在结合 RbHe 对势能中直接形成复合物一致。光电离光谱和角分布与 RbHe(N) 复合物的赝双原子模型很好地吻合。激发态中的排斥相互作用导致快速离解，随后自由 Rb 原子以及 RbHe 和 RbHe(2) 复合物的光电离。
