Zhang Wenbin, Li Zhichao, Lu Peifen, Gong Xiaochun, Song Qiying, Ji Qinying, Lin Kang, Ma Junyang, He Feng, Zeng Heping, Wu Jian
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Key Laboratory of Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China.
Phys Rev Lett. 2016 Sep 2;117(10):103002. doi: 10.1103/PhysRevLett.117.103002. Epub 2016 Sep 1.
Molecules exposed to strong laser fields may coherently absorb multiple photons and deposit the energy into electrons and nuclei, triggering the succeeding dynamics as the primary stage of the light-molecule interaction. We experimentally explore the electron-nuclear sharing of the absorbed photon energy in above-threshold multiphoton single ionization of multielectron molecules. Using CO as a prototype, vibrational and orbital resolved electron-nuclear sharing of the photon energy is observed. Different from the simplest one- or two-electron systems, the participation of the multiple orbitals and the coupling of various electronic states in the strong-field ionization and dissociation processes alter the photon energy deposition dynamics of the multielectron molecule. The population of numerous vibrational states of the molecular cation as the energy reservoir in the ionization process plays an important role in photon energy sharing between the emitted electron and the nuclear fragments.
暴露于强激光场中的分子可能会相干地吸收多个光子，并将能量沉积到电子和原子核中，引发后续动力学过程，这是光与分子相互作用的初级阶段。我们通过实验探索了多电子分子阈上多光子单电离过程中吸收光子能量的电子-核分配情况。以一氧化碳作为原型，观测到了光子能量在振动和轨道分辨下的电子-核分配。与最简单的单电子或双电子系统不同，多电子分子在强场电离和解离过程中多个轨道的参与以及各种电子态的耦合改变了光子能量沉积动力学。分子阳离子众多振动态作为电离过程中的能量储存库，在发射电子与核碎片之间的光子能量分配中起着重要作用。
