Signatures of magnetic-field effects in nonsequential double ionization manifesting as backscattering for molecules versus forward scattering for atoms
Signatures of magnetic-field effects in nonsequential double ionization manifesting as backscattering for molecules versus forward scattering for atoms
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DOI：
10.1103/physreva.103.033115
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发表时间：
2020-12
影响因子：
2.9
通讯作者：
G. P. Katsoulis;M. Peters;A. Staudte;R. Bhardwaj;A. Emmanouilidou
中科院分区：
文献类型：
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作者：
G. P. Katsoulis;M. Peters;A. Staudte;R. Bhardwaj;A. Emmanouilidou
对于双电子双原子分子，我们研究了非顺序双电离中的磁场效应。我们这样做，制定一个三维的半经典模型，充分占库仑奇点和磁场效应在时间传播。使用这个模型，我们确定了一个突出的签名的非偶极子效应。也就是说，我们证明了电子的背散射沿着光的传播方向。因此，该电子由于磁场而与动量变化的方向相反地逃逸。这与强驱动的原子形成鲜明对比，在强驱动的原子中，滑翔的电子沿着光传播的方向沿着向前散射。我们将这些不同的特征归因于磁场与分子中的软碰撞相比于原子中的硬碰撞共同创建的不同门。这两个不同的门在跃迁前不久产生了跃迁电子沿光传播方向沿着不同的动量和位置。结果表明，来自原子核的库仑力使分子中的滑移电子沿光的传播方向反向散射，而使原子中的滑移电子沿光的传播方向沿着向前散射。
For two-electron diatomic molecules, we investigate magnetic field effects in non-sequential double ionization where recollisions prevail. We do so by formulating a three-dimensional semi-classical model that fully accounts for the Coulomb singularities and for magnetic field effects during time propagation. Using this model, we identify a prominent signature of non-dipole effects. Namely, we demonstrate that the recolliding electron back-scatters along the direction of light propagation. Hence, this electron escapes opposite to the direction of change in momentum due to the magnetic field. This is in striking contrast to strongly-driven atoms where the recolliding electron forward-scatters along the direction of light propagation. We attribute these distinct signatures to the different gate that the magnetic field creates jointly with a soft recollision in molecules compared to a hard recollision in atoms. These two different gates give rise, shortly before recollision, to different momenta and positions of the recolliding electron along the direction of light propagation. As a result, we show that the Coulomb forces from the nuclei act to back-scatter the recolliding electron in molecules and forward-scatter it in atoms along the direction of light propagation.