Recent angle-resolved experiments using reconstruction of attosecond bursts by interference of two-photon transitions (RABBITT) have shown that the photoionization time delay depends on the emission angle of the photoelectron. In this paper we demonstrate that for photoemission from helium accompanied by shake-up (correlation satellites) the angular variation of the time delay is dramatically enhanced by the dipolar coupling between the photoelectron and the highly polarizable residual ion in the IR field. We show that the additivity rule for the time delays due to the atomic potential, the continuum-continuum coupling by the IR field, and due to this two-electron process remains valid for angle-resolved RABBITT. Our results are expected to be also applicable to other multielectron systems that are highly polarizable or feature a permanent dipole moment.

中文翻译：

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氦气振摇电离的角度分辨时间延迟

最近通过利用双光子跃迁的干扰重建阿秒脉冲的角度分辨实验（RABBITT）表明，光电离时间延迟取决于光电子的发射角。在本文中，我们证明了对于氦气伴随伴有摇动（相关卫星）的光发射，光电子与IR场中高度极化的残留离子之间的偶极耦合会大大增强时间延迟的角度变化。我们表明，由于原子势，IR场的连续-连续耦合以及由于这种两电子过程的时间延迟的加和性规则对于角度分辨的RABBITT仍然有效。