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arXiv 1902.01607physics.atom-phnlin.CD
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laser -原子相互作用中库仑效应的考虑

Inclusion of Coulomb effects in laser-atom interactions

Jonathan Dubois, Simon Berman, Cristel Chandre, Turgay Uzer

摘要:

我们研究了库仑相互作用在强场过程中的作用。我们发现,库仑场的离子使其存在已知的,即使在高强度的激光场,在强场近似的假设相反。本文用四种模型分析了任意激光偏振态下电子电离后的动力学行为:偶极近似下的哈密顿模型、强场近似下的哈密顿模型、库仑修正强场近似下的哈密顿模型和导引中心模型。这些模型清楚地说明了库仑效应,特别是库仑聚焦和库仑不对称。我们表明,库仑校正的强场近似和指导中心是互补的,在这个意义上说,库仑校正的强场近似描述以及短时间尺度的现象(短于激光周期),而指导中心是非常适合于描述长时间尺度的现象(长于激光周期),如库仑驱动的共振和里德堡态的创建。

英文摘要:

We investigate the role of the Coulomb interaction in strong field processes. We find that the Coulomb field of the ion makes its presence known even in highly intense laser fields, in contrast to the assumptions of the strong field approximation. The dynamics of the electron after ionization is analyzed with four models for an arbitrary laser polarization: the Hamiltonian model in the dipole approximation, the strong field approximation, the Coulomb-corrected strong field approximation and the guiding center. These models illustrate clearly the Coulomb effects, in particular Coulomb focusing and Coulomb asymmetry. We show that the Coulomb-corrected strong field approximation and the guiding center are complementary, in the sense that the Coulomb-corrected strong field approximation describes well short time scale phenomena (shorter than a laser cycle) while the guiding center is well suited for describing long time scale phenomena (longer than a laser cycle) like Coulomb-driven recollisions and Rydberg state creation.

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