Retrieval of Electron-Atom Scattering Cross Sections from Laser-Induced Electron Rescattering of Atomic Negative Ions in Intense Laser Fields
Retrieval of Electron-Atom Scattering Cross Sections from Laser-Induced Electron Rescattering of Atomic Negative Ions in Intense Laser Fields
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DOI：
10.1103/physreva.77.053410
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发表时间：
2007-12
影响因子：
2.9
通讯作者：
Xiaoxin Zhou;Zhangjin Chen;T. Morishita;A. Le;C. Lin
中科院分区：
文献类型：
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作者：
Xiaoxin Zhou;Zhangjin Chen;T. Morishita;A. Le;C. Lin
我们通过求解瞬态薛定格方程（TDSE）并使用一阶和二阶强场近似（SFA）研究了强激光场中原子负离子的二维电子动量分布。我们表明，从SFA预测的光电子能谱和低能光电子动量分布与TDSE的解具有合理的一致性。更重要的是，我们表明可以直接从高能场近似中反演精确的电子-原子弹性散射截面。激光场中原子负离子的电子动量谱，这开辟了分别通过强短激光测量原子和分子负离子光脱离的电子-原子和电子-分子散射截面的可能性，时间分辨率为飞秒级。
We investigated the two-dimensional electron momentum distributions of atomic negative ions in an intense laser field by solving the time-dependent Schr\"odinger equation (TDSE) and using the first- and second-order strong-field approximations (SFAs). We showed that photoelectron energy spectra and low-energy photoelectron momentum distributions predicted from SFAs are in reasonable agreement with the solutions from the TDSE. More importantly, we showed that accurate electron-atom elastic scattering cross sections can be retrieved directly from high-energy electron momentum spectra of atomic negative ions in the laser field. This opens up the possibility of measuring electron-atom and electron-molecule scattering cross sections from the photodetachment of atomic and molecular negative ions by intense short lasers, respectively, with temporal resolutions in the order of femtoseconds.