Quantum dynamics with fermion coupled coherent states: Theory and application to electron dynamics in laser fields
Quantum dynamics with fermion coupled coherent states: Theory and application to electron dynamics in laser fields
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DOI：
10.1103/physreva.84.033406
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发表时间：
2011-09
影响因子：
2.9
通讯作者：
A. Kirrander;D. Shalashilin
中科院分区：
文献类型：
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作者：
A. Kirrander;D. Shalashilin
我们提出了一个替代版本的耦合相干态方法，特别适用于解决含时薛定谔方程的多电子动力学的原子和分子。该理论明确考虑了费米子粒子的交换对称性，并使用费米子分子动力学来传播轨迹。作为示范，在He原子的计算进行使用完整的哈密顿量和准确的实验参数。在10{sup 14}-10{sup 16} W/cm{sup 2}范围内，计算了160 fs和780 nm激光脉冲的单电离和双电离产额与场强的关系，与步行者等人的实验结果符合得很好。由于该方法是基于轨迹的，因此动力学的机械分析是直接的。我们还计算了半经典动量分布的双电离以下25 fs和795 nm的脉冲在1.5x10{sup 15} W/cm{sup 2}，为了比较它们与详细的实验Rudenko等人。对于这个更具挑战性的任务，完全收敛没有实现。然而，主要的影响，如指状结构的动量分布再现。
We present an alternate version of the coupled-coherent-state method, specifically adapted for solving the time-dependent Schroedinger equation for multielectron dynamics in atoms and molecules. This theory takes explicit account of the exchange symmetry of fermion particles, and it uses fermion molecular dynamics to propagate trajectories. As a demonstration, calculations in the He atom are performed using the full Hamiltonian and accurate experimental parameters. Single- and double-ionization yields by 160-fs and 780-nm laser pulses are calculated as a function of field intensity in the range 10{sup 14}-10{sup 16} W/cm{sup 2}, and good agreement with experiments by Walker et al. is obtained. Since this method is trajectory based, mechanistic analysis of the dynamics is straightforward. We also calculate semiclassical momentum distributions for double ionization following 25-fs and 795-nm pulses at 1.5x10{sup 15} W/cm{sup 2}, in order to compare them with the detailed experiments by Rudenko et al. For this more challenging task, full convergence is not achieved. However, major effects such as the fingerlike structures in the momentum distribution are reproduced.