论文标题
部分可观测时空混沌系统的无模型预测
Resonant two-photon ionization of helium atoms studied by attosecond interferometry
论文作者
论文摘要
我们通过$ 1S3P $，$ 1S4P $和$ 1S5P^1 $ p $ _1 $状态研究氦原子的共振两光原子，并使用15 $^\ MATHRM {th} $谐波的钛titanium-sapphire Laser激发和弱点的激发和较弱的激光领域的激发和iRASERIAID的弱点。光电子波袋的阶段通过使用17 $^\ mathrm {th} $谐波来测量通过Attosond干涉技术测量。我们使用速度图成像光谱仪和使用磁性瓶电子光谱仪进行高能分辨率进行角度分辨率进行实验。我们的结果与使用两光子随机相近似（交换）进行了比较，以说明电子相关效应。我们对观察到的多个$π$ -RAD相位跳跃进行解释，无论是在共振上还是远离共振，及其对发射角的依赖性。
We study resonant two-photon ionization of helium atoms via the $1s3p$, $1s4p$ and $1s5p^1$P$_1$ states using the 15$^\mathrm{th}$ harmonic of a titanium-sapphire laser for the excitation and a weak fraction of the laser field for the ionization. The phase of the photoelectron wavepackets is measured by an attosecond interferometric technique, using the 17$^\mathrm{th}$ harmonic. We perform experiments with angular resolution using a velocity map imaging spectrometer and with high energy resolution using a magnetic bottle electron spectrometer. Our results are compared to calculations using the two-photon random phase approximation with exchange to account for electron correlation effects. We give an interpretation for the multiple $π$-rad phase jumps observed, both at and away from resonance, as well as their dependence on the emission angle.
