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arXiv 1302.4047physics.atom-phphysics.optics
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大永久偶极子对分子轨道层析成像的影响

Influence of large permanent dipoles on molecular orbital tomography

Xiaosong Zhu, Meiyan Qin, Qingbin Zhang, Yang Li, Zhizhan Xu, Peixiang Lu

摘要:

研究了大永久偶极子对高次谐波分子轨道层析成像的影响。研究发现,由于斯塔克位移对电离率的影响,即使在几个周期的驱动脉冲下,也不能满足层析成像的单侧电离条件。为了克服这个问题,我们采用了一个定制的驱动脉冲,通过添加一个弱的低频脉冲的几个周期的激光脉冲来控制HHG过程和连续电子的碰撞被有效地限制在只有一侧的核心。在此基础上,对轨道进行了长度和速度两种形式的重建。结果表明,两种形式的轨道结构都只能通过垂直于永久偶极子投影的偶极子矩阵元来再现。

英文摘要:

The influence of large permanent dipoles on molecular orbital tomography via high-order harmonic generation (HHG) is investigated in this work. It is found that, owing to the modification of the angle-dependent ionization rate resulting from the Stark shift, the one-side-recollision condition for the tomographic imaging can not be satisfied even with the few-cycle driving pulses. To overcome this problem, we employ a tailored driving pulse by adding a weak low-frequency pulse to the few-cycle laser pulse to control the HHG process and the recollision of the continuum electrons are effectively restricted to only one side of the core. Then we carried out the orbital reconstruction in both the length and velocity forms. The results show that, the orbital structure can only be successfully reproduced by using the dipole matrix elements projected perpendicular to the permanent dipole in both forms.

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