Absolute triply differential cross sections for double photoionization of helium at 10, 20, and 52.9 eV above threshold.
Absolute triply differential cross sections for double photoionization of helium at 10, 20, and 52.9 eV above threshold.
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在高于阈值 10、20 和 52.9 eV 时氦双光电离的绝对三重微分横截面。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
R. Shakeshaft
中科院分区：
文献类型：
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作者：
M. Pont;R. Shakeshaft
计算了氦原子在阈上总能量为10、20和52.9 eV时单光子双电离的共面三重微分截面（TDCS）。我们的结果与最近测量和计算的角分布[O. Schwarzkopf，B. Kraessig，J. Elmiger，and V.施密特，Phys. Rev. Lett. [bold 70]，3008（1993）; O. Schwarzkopf，B. Kraessig，V.施密特，F. Maulbetsch和J.S. Briggs，J. Phys. B [bold 27]，L347（1994）; F. Maulbetsch和J.S. Briggs，[ital ibid]. [bold 26]，L 647（1993）]对于相等能量共享的情况（光电子能量[ital E][sub 1]和[ital E][sub 2]，使得[ital E][sub 1]=[ital E][sub 2]=5 eV和[ital E][sub 1]=[ital E][sub 2]=10 eV）和不相等的能量共享（[ital E][sub 1]=5 eV，[ital E][sub 2]=47.9 eV）。与以前的TDCS计算相反，我们的计算是基于一个基本设置的方法，原则上是精确的，我们得到的TDCS的[ital绝对]值相对于基本尺寸收敛得相当好。
We have calculated the coplanar triply differential cross section (TDCS) for double ionization of helium by one photon at total energies of 10, 20, and 52.9 eV above threshold. Our results agree very well with recently measured and calculated angular distributions [O. Schwarzkopf, B. Kraessig, J. Elmiger, and V. Schmidt, Phys. Rev. Lett. [bold 70], 3008 (1993); O. Schwarzkopf, B. Kraessig, V. Schmidt, F. Maulbetsch, and J. S. Briggs, J. Phys. B [bold 27], L347 (1994); F. Maulbetsch and J. S. Briggs, [ital ibid]. [bold 26], L647 (1993)] for the cases of equal energy sharing (photoelectron energies [ital E][sub 1] and [ital E][sub 2], such that [ital E][sub 1]=[ital E][sub 2]=5 eV and [ital E][sub 1]=[ital E][sub 2]=10 eV) and unequal energy sharing ([ital E][sub 1]=5 eV, [ital E][sub 2]=47.9 eV). In contrast to previous calculations of the TDCS, our calculation is based on a basis-set method that is, in principle, exact, and we obtain [ital absolute] values of the TDCS that are fairly well converged with respect to the basis size.