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首页> 外文期刊>Journal of Physics, B. Atomic, Molecular and Optical Physics: An Institute of Physics Journal >Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses
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Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

机译：超短极紫外自由电子激光脉冲对氦气的两个光子电离的光电子角分布

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摘要

The two-photon ionization of helium atoms by ultrashort extreme-ultraviolet free-electron laser pulses, produced by the SPring-8 Compact SASE Source test accelerator, was investigated at photon energies of 20.3, 21.3, 23.0 and 24.3 eV. The angular distribution of photoelectrons generated by two-photon ionization is obtained using a velocity map imaging spectrometer. The phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets are extracted from the photoelectron angular distributions. The obtained values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to a resonance with an excited level or Rydberg manifold. The difference stems from the co-presence of resonant and non-resonant path contributions in the two-photon ionization by femtosecond pulses. Since the relative contribution of both paths can be controlled in principle by the pulse shape, these results illustrate a new way to tailor the continuum wave packet.
机译：在20.3、21.3、23.0和24.3 eV的光子能量下，研究了由SPring-8 Compact SASE Source测试加速器产生的超短极紫外自由电子激光脉冲对氦原子的双光子电离。使用速度图成像光谱仪获得由双光子电离产生的光电子的角度分布。从光电子角度分布中提取出s和d连续谱波包的相移差和振幅比。当将光子能量调谐到具有激发能级或Rydberg流形的共振时，所获得的相移差值不同于散射相移差。差异源自飞秒脉冲在双光子电离中共振和非共振路径贡献的共存。由于原则上可以通过脉冲形状控制两条路径的相对贡献，因此这些结果说明了一种调整连续波包的新方法。

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