Resonancelike enhancement in high-order above-threshold ionization of molecules
Resonancelike enhancement in high-order above-threshold ionization of molecules
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DOI：
10.1103/physreva.88.021401
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发表时间：
2013-08
影响因子：
2.9
通讯作者：
W. Quan;X. Lai;YongJu Chen;ChuanLiang Wang;Zilong Hu;Xiaojun Liu;X. Hao;J. Chen;E. Hasović;M. Busuladžić;W. Becker;D. Milošević
中科院分区：
文献类型：
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作者：
W. Quan;X. Lai;YongJu Chen;ChuanLiang Wang;Zilong Hu;Xiaojun Liu;X. Hao;J. Chen;E. Hasović;M. Busuladžić;W. Becker;D. Milošević
高阶阈值以上电离的光电子能谱中相邻峰群的共振增强已经被很好地记录下来，用于强红外激光脉冲下的稀有气体原子。然而，它的物理起源仍在争论中。在这个快速通信中，我们从实验和理论上研究了双原子氮和氧分子的高阶阈值以上电离，以揭示更多的潜在机制。在实验中可以观察到N-2分子的共振增强，而O-2分子则没有。在s矩阵理论和强场近似的基础上进行了模拟，再现了实验结果。这意味着类共振增强可归因于通道关闭效应。在分子系统中，特定的分子结构对这种增强的存在与否起着决定性的作用。
Rresonancelike enhancement of groups of adjacent peaks in the photoelectron spectrum of high-order above-threshold ionization has been well documented for noble-gas atoms subjected to intense infrared laser pulses. However, its physical origin is still under debate. In this Rapid Communication, we investigate experimentally and theoretically high-order above-threshold ionization of diatomic nitrogen and oxygen molecules in order to shed more light on the underlying mechanism. The resonancelike enhancement is experimentally observed for N-2 but is absent for O-2 molecules. A simulation on the basis of S-matrix theory and the strong-field approximation reproduces the experimental observations. This implies that the resonancelike enhancement can be attributed to the channel-closing effect. The specific molecular structure plays a decisive role for the presence or absence of this enhancement in molecular systems.