Strong-field ionization of polar molecules: Stark-shift-corrected strong-field approximation
Strong-field ionization of polar molecules: Stark-shift-corrected strong-field approximation
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DOI：
10.1103/physreva.82.053404
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发表时间：
2010-11-04
影响因子：
2.9
通讯作者：
Madsen, L. B.
中科院分区：
文献类型：
--
作者：
Dimitrovski, D.;Martiny, C. P. J.;Madsen, L. B.
在隧道极限下，我们扩展了分子电离的强场近似，系统地包括了电离分子轨道的线性和二次静态斯塔克位移。这种方法易于实现，能够描述圆偏振激光脉冲对定向极性分子强场电离过程的基本物理性质。本文还讨论了分子轨道在强场中的变化，并在内部电子极端极化的情况下，设计了一个简单的模型。我们发现我们的模型的结果与最近在定向羰基硫化物和苯腈分子的电离实验中得到的结果非常吻合。Holmegaard et al.，自然物理，6,428(2010)]。
We extend the molecular strong-field approximation for ionization, in the tunneling limit, to include systematically the linear and quadratic static Stark shifts of the ionizing molecular orbital. This approach, simple to implement, is capable of describing the essential physics of the process of strong-field ionization of oriented polar molecules by circularly polarized laser pulses. The modification of the molecular orbitals in strong fields is also discussed and in cases of extreme polarization of inner electrons a simple model is devised. We find very good agreement between the results from our model and those obtained in the recent experiment on ionizaton of oriented carbonyl sulphide and benzonitrile molecules [L. Holmegaard et al., Nature Phys. 6, 428 (2010)].