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Partial Photoionization Cross Section of Collinear eZe Helium: Numerical Confirmation of Semiclassical Predictions

Authors
Lee, Min-HoChoi, Nark Nyul
Issue Date
Nov-2018
Publisher
KOREAN PHYSICAL SOC
Keywords
Partial photoionization cross section; Scaling law; Collinear eZe helium; CTCO
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.73, no.10, pp.1486 - 1494
Journal Title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume
73
Number
10
Start Page
1486
End Page
1494
URI
https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/295
DOI
10.3938/jkps.73.1486
ISSN
0374-4884
Abstract
Based on the semiclassical theory of chaotic scattering, Tanner et al. [J. Phys. B 40, F157 (2007)] proposed the fluctuation in the partial photoionization cross section of helium below the double-ionization threshold would show the same characteristics as in the total cross section, predicting that the Fourier spectrum of the fluctuation reveals peaks at the classical actions of closed triple collision orbits and the amplitude of the fluctuation decreases algebraically as the energy approaches the double-ionization threshold. In that paper, however, the predictions were not clearly confirmed due to the lack of experimental data with sufficient accuracy. So instead, we calculate the partial photoionization cross sections of collinear eZe helium for the energy range from the single-ionization threshold I-20 to I-32 in order to numerically confirm the predictions. Analysis of the fluctuation in the partial cross section shows that the predictions are indeed valid. Our findings mean that the fluctuation in the partial photoionization cross section can be described by classical triple collision orbits in the semiclassical limit. Thus it explains in a natural way the mirroring and mimicking structures observed in cross section signals for different ionization channels.
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