多光子电离 regime 中原子和分子单电离的比较研究。 （注：这里“regime”常见释义为“政权；政体；管理制度”等，结合语境可能不太好准确译出其在该专业领域的特定含义，可根据实际专业背景进一步优化表述）
Comparison study of atomic and molecular single ionization in the multiphoton ionization regime.
作者信息
Wu Jian, Zeng Heping, Guo Chunlei
机构信息
The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
出版信息
Phys Rev Lett. 2006 Jun 23;96(24):243002. doi: 10.1103/PhysRevLett.96.243002. Epub 2006 Jun 21.
In this Letter, we report, for the first time in the multiphoton ionization regime, a comparison study of single-electron ionization of diatomic molecules versus rare gas atoms with virtually the same ionization potentials. In comparing N2+ to Ar+, a higher ion signal is seen in N2+ compared to Ar+ for linear polarization but the difference vanishes in circularly polarized light. In comparing O2+ to Xe+, we observe a suppression in O2+ compared to Xe+ for both linear and circular polarization but this suppression exhibits an intensity dependence; i.e., there is little suppression for O2+ at the lowest intensity range, but the suppression becomes increasingly stronger as the laser intensity increases. The multielectron screening model is used to discuss possible mechanisms of this intensity dependent suppression in O2+ in the multiphoton ionization regime.
在本信函中，我们首次报道了在多光子电离 regime 下，对具有几乎相同电离势的双原子分子与稀有气体原子的单电子电离进行的比较研究。在将 N₂⁺ 与 Ar⁺ 进行比较时，对于线偏振，N₂⁺ 中观察到的离子信号高于 Ar⁺，但在圆偏振光中这种差异消失。在将 O₂⁺ 与 Xe⁺ 进行比较时，对于线偏振和圆偏振，我们都观察到 O₂⁺ 相对于 Xe⁺ 存在抑制，但这种抑制呈现出强度依赖性；即，在最低强度范围内 O₂⁺ 的抑制很小，但随着激光强度增加，抑制变得越来越强。多电子屏蔽模型被用于讨论在多光子电离 regime 下 O₂⁺ 中这种强度依赖性抑制的可能机制。
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