Mechanisms of photo double ionization of helium by 530 eV photons -: art. no. 033004
Mechanisms of photo double ionization of helium by 530 eV photons -: art. no. 033004
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DOI：
10.1103/physrevlett.89.033004
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发表时间：
2002-07-15
影响因子：
8.6
通讯作者：
Dörner, R
中科院分区：
文献类型：
--
作者：
Knapp, A;Kheifets, A;Dörner, R
我们已经测量了全微分截面的光双电离氦450 eV以上的阈值。我们发现光电子之间的能量分配是极不对称的，快电子和慢电子的角不对称参数分别为β相似或等于2和β相似或等于0。电子的角分布显示了占主导地位的2 eV的电子和明确的证据，在电子能量为30 eV的非弹性电子-电子散射的抖离。的数据是在良好的协议与收敛的紧耦合计算。
We have measured fully differential cross sections for photo double ionization of helium 450 eV above the threshold. We have found an extremely asymmetric energy sharing between the photoelectrons and an angular asymmetry parameter betasimilar or equal to2 and betasimilar or equal to0 for the fast and slow electrons, respectively. The electron angular distributions show a dominance of the shakeoff for 2 eV electrons and clear evidence of an inelastic electron-electron scattering at an electron energy of 30 eV . The data are in excellent agreement with convergent close-coupling calculations.