Coppens François, von Vangerow Johannes, Barranco Manuel, Halberstadt Nadine, Stienkemeier Frank, Pi Martí, Mudrich Marcel
Laboratoire des Collisions, Agrégats, Réactivité, IRSAMC, Université Toulouse 3- Paul Sabatier, CNRS UMR 5589, 118 route de Narbonne, F-31062 Toulouse Cedex 09, France.
Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany.
Phys Chem Chem Phys. 2018 Apr 4;20(14):9309-9320. doi: 10.1039/C8CP00482J.
Doped He nanodroplets are ideal model systems to study the dynamics of elementary photophysical processes in heterogeneous nanosystems. Here we present a combined experimental and theoretical investigation of the formation of free RbHe exciplex molecules from laser-excited Rb-doped He nanodroplets. Upon excitation of a droplet-bound Rb atom to the 5p3/22Π3/2-state, a stable RbHe exciplex forms within about 20 ps. Only due to 2Π3/2 → 2Π1/2 spin-relaxation does the RbHe exciplex detach from the He droplet surface with a half life of about 700 ps, given by the spin-relaxation time and the coupling of spin and translational degrees of freedom.
掺杂的氦纳米液滴是研究异质纳米系统中基本光物理过程动力学的理想模型系统。在此，我们对激光激发的铷掺杂氦纳米液滴中自由RbHe激基复合物分子的形成进行了实验与理论相结合的研究。当液滴束缚的铷原子被激发到5p3/2 2Π3/2态时，一个稳定的RbHe激基复合物在约20皮秒内形成。仅由于2Π3/2→2Π1/2自旋弛豫，RbHe激基复合物才会从氦液滴表面脱离，其半衰期约为700皮秒，这由自旋弛豫时间以及自旋与平动自由度的耦合决定。
