Loginov Evgeniy, Drabbels Marcel
Laboratoire de Chimie Physique Moléculaire, Ecole polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland.
J Phys Chem A. 2014 Apr 17;118(15):2738-48. doi: 10.1021/jp4121996. Epub 2014 Apr 4.
The dynamics of laser-excited sodium atoms at the surface of helium nanodroplets has been investigated as a function of quantum state. For all cases, excitation of the system leads to desorption of the sodium atom from the droplet surface. The mean kinetic energy of the desorbed atoms scales linearly with excitation frequency, indicative of an impulsive desorption process. The energy partitioning between the helium and the desorbing sodium atom depends on the quantum state and appears to be related to the size and shape of the electron orbital. The speed distributions of desorbed NaHe exciplexes point toward a direct formation process of an exciplex with no internal energy. Photoelectron spectroscopy reveals an increasing importance of helium-induced relaxation with increasing quantum state, which is tentatively attributed to curve crossing between different NaHeN interaction potentials during the desorption process.
已研究了氦纳米液滴表面激光激发钠原子的动力学与量子态的函数关系。在所有情况下，系统的激发都会导致钠原子从液滴表面解吸。解吸原子的平均动能与激发频率呈线性比例关系，这表明是一个脉冲解吸过程。氦与解吸钠原子之间的能量分配取决于量子态，并且似乎与电子轨道的大小和形状有关。解吸的NaHe激基复合物的速度分布表明形成了没有内能的激基复合物的直接过程。光电子能谱显示，随着量子态的增加，氦诱导的弛豫的重要性日益增加，这初步归因于解吸过程中不同NaHeN相互作用势之间的曲线交叉。
