Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, D-60438 Frankfurt, Germany.
J Chem Phys. 2012 Sep 14;137(10):104308. doi: 10.1063/1.4750980.
We use intense femtosecond laser pulses to multiply ionize and directly image the structures of N(2)Ar, O(2)Ar, and O(2)Xe dimers by coincidently measuring the momenta of the fragment ions. All these dimers are found to have an equilibrium T-shaped structure in which the bond of the diatomic molecule is perpendicular to the dimer axis. The equilibrium distance between the rare-gas atom and the center-of-mass of the diatomic molecule is estimated to be R(N2-Ar) ~ 3.86 Å, R(O2-Ar) ~ 3.65 Å, and R(O2-Xe) ~ 4.07 Å, respectively. For the T-shaped N(2)Ar dimer, both sequential and direct triple-ionization-induced three-body breakups are observed. In contrast to N(2)Ar dimer, other structures are found to coexist with the dominating T-shaped one for O(2)Ar and O(2)Xe.
我们使用高强度飞秒激光脉冲通过同时测量碎片离子的动量来实现 N(2)Ar、O(2)Ar 和 O(2)Xe 二聚体的多电离并直接成像。所有这些二聚体都被发现具有平衡的 T 形结构，其中双原子分子的键垂直于二聚体轴。稀有气体原子与双原子分子质心之间的平衡距离估计分别为 R(N2-Ar)3.86 Å，R(O2-Ar)3.65 Å 和 R(O2-Xe)~4.07 Å。对于 T 形 N(2)Ar 二聚体，观察到了顺序和直接的三重电离诱导的三体断裂。与 N(2)Ar 二聚体不同，对于 O(2)Ar 和 O(2)Xe，还发现了其他结构与主导的 T 形结构共存。
