Continuum phase shifts and partial cross sections for photoionization from excited states of atomic helium measured by high-order harmonic optical pump-probe velocity map imaging
Continuum phase shifts and partial cross sections for photoionization from excited states of atomic helium measured by high-order harmonic optical pump-probe velocity map imaging
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DOI：
10.1103/physreva.79.031401
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发表时间：
2009-03
影响因子：
2.9
通讯作者：
L. Haber;Benjamin Doughty;S. Leone
中科院分区：
文献类型：
--
作者：
L. Haber;Benjamin Doughty;S. Leone
利用泵-探针速度图成像直接测量了状态选择氦原子的出射波和连续波的径向偶极矩阵元素的相移差和比值。氦中的排列态是由高次谐波形成的，用800、400或光电离。结果允许确定能量依赖的量子缺陷差异和部分截面的比率，并与电子散射和光电离的理论计算一致。
Phase shift differences and ratios of radial dipole matrix elements of the outgoingandcontinuum waves from state-selected helium atoms are directly measured from the photoelectron angular distributions using pump-probe velocity map imaging. Alignedandstates in helium are prepared by high-order harmonics and ionized with either 800, 400, orlight. The results allow for the determination of energy-dependent quantum defect differences and ratios of partial cross sections and agree favorably with theoretical calculations on electron scattering and photoionization.