Attosecond streaking of molecules in the low-energy region studied by a wavefunction splitting scheme
Attosecond streaking of molecules in the low-energy region studied by a wavefunction splitting scheme
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通过波函数分裂方案研究低能区分子的阿秒条纹
DOI：
10.1088/0953-4075/45/7/074019
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发表时间：
2012-03
期刊：
影响因子：
--
通讯作者：
Qihuang Gong
中科院分区：
文献类型：
--
作者：
Xue-Feng Hou;Liang-You Peng;Qi-Cheng Ning;Qihuang Gong
本文从理论上研究了红外(IR)激光场作用下单阿秒脉冲产生的氢分子离子的低能光电子能谱。为了研究这种分子的阿秒条纹，我们发展了一种非常有效的基于网格的数值方法来求解长球面坐标下的双中心含时薛定谔方程(TDSE)。具体而言，径向坐标用有限元离散变量表示法(FE-DVR)离散，角坐标用普通离散变量表示法离散，便于并行计算。当存在IR场时，利用波函数分裂方案来降低对求解相应TDSE的计算资源的要求。在验证了方法的准确性和效率后，我们将其应用于H+2在低能区的阿秒条纹光谱的研究。与高能区通常的阿秒条纹不同，部分低能电子可能会被驱回，与剩余的双中心核重新散射。在低能区存在着非常有趣的干扰结构。当核间距离很小时，它们与我们最近在原子情况下观察到的非常相似。
We present a theoretical study of the low-energy photoelectron spectra of hydrogen molecular ion generated by a single attosecond pulse in the presence of an infrared (IR) laser field. In order to investigate this type of attosecond streaking of molecules, we developed a very efficient grid-based numerical method to solve the two-centre time-dependent Schrödinger equation (TDSE) in the prolate spheroidal coordinates. Specifically, the radial coordinate is discretized with the finite-element discrete variable representation (FE-DVR) for easy parallel computation and the angular coordinate with the usual DVR. A wavefunction splitting scheme is utilized to reduce the demanding requirement of the computational resource to solve the corresponding TDSE when an IR field is present. After verification of the accuracy and efficiency of our method, we then apply it to investigate the attosecond streaking spectra of H+2 in the low-energy region. In contrast to the usual attosecond streaking in the high-energy region, part of the low-energy electrons may be driven back to rescatter with the residual two-centre core. Very interesting interference structures are present in the low-energy region. When the internuclear distance is small, they are very similar to what we have recently observed in the atomic case.
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