State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Phys Rev Lett. 2013 Aug 23;111(8):083003. doi: 10.1103/PhysRevLett.111.083003. Epub 2013 Aug 20.
We study the order in which a strong laser field removes multiple electrons from a van der Waals (vdW) cluster. The N2Ar, with an equilibrium T-shaped geometry, contains both a covalent and a vdW bond and serves as a simple yet rich example. Interestingly, the fragmenting double and triple ionizations of N2Ar with vdW bond breaking are favored when the vdW bond is aligned along the laser field polarization vector. However, the orientation of the covalent bond with respect to the laser field rules the triple ionization when both the covalent and vdW bonds are simultaneously broken. Electron-localization-assisted enhanced ionization and molecular orbital profile-dominated, orientation-dependent ionization are discussed to reveal the order of electrons release from different sites of N2Ar.
我们研究了强激光场从范德华（vdW）团簇中移除多个电子的顺序。具有平衡 T 形几何形状的 N2Ar 包含共价键和 vdW 键，是一个简单而丰富的例子。有趣的是，当 vdW 键沿激光场偏振方向排列时，具有 vdW 键断裂的 N2Ar 的双电离和三电离的碎裂更为有利。然而，当同时断裂共价键和 vdW 键时，共价键相对于激光场的方向决定了三重电离。讨论了电子局域辅助增强电离和分子轨道轮廓主导、取向依赖电离，以揭示 N2Ar 不同部位释放电子的顺序。
