论文标题
极性分子的两色光（Rabbitt）光电离的偶极激光耦合延迟
Dipole-laser coupling delay in two-color (RABBITT) photoionization of polar molecules
论文作者
论文摘要
从理论上讲，我们通过在强极分子中的两光子过渡（Rabbitt）的干扰来重建Attsond殴打。红外分子（IR）场中极性分子的时间依赖性能量产生了额外的偶极激光偶联贡献对侧带延迟的贡献。在不依赖时间的图片中，这转化为初始状态成为红外状态的线性组合。我们将最近开发的时间独立于分子R-Matrix方法扩展到包括由IR压缩初始状态引起的附加干扰电离途径，并与参考非扰动时间依赖性的Rabbitt模拟获得非常良好的一致性。我们讨论了这种电离幅度的渐近行为，并恢复已知的近似渐近公式，用于在Attosecond Streaking的背景下于早期得出的偶极激光偶联延迟。在低光子能量下，偶极激光偶联即使在无定向的分子样品中也会显着贡献。最后，我们表明，在极性单一电荷负离子的光检查中，边带延迟仅与Wigner延迟成正比。
We study theoretically the reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) in strongly polar molecules. The time-dependent energy of a polar molecule in the infrared (IR) field gives rise to an additional dipole-laser coupling contribution to the sideband delay. In a time-independent picture this translates to the initial state becoming a linear combination of IR-dressed states. We extend the recently developed time-independent molecular R-matrix method to include the additional interfering ionization pathways arising from the IR-dressed initial state and obtain very good agreement with a reference non-perturbative time-dependent RABBITT simulation. We discuss the asymptotic behaviour of such ionization amplitudes and recover a known approximate asymptotic formula for the dipole-laser coupling delay derived earlier in the context of attosecond streaking. At low photon energies the dipole-laser coupling contributes significantly even in an unoriented molecular sample. Finally, we show that in photodetachment of polar singly charged negative ions the sideband delay is asymptotically proportional only to Wigner delay.
