Angular dependent time delay near correlation induced Cooper minima
Date
2020
Authors
Kheifets, Anatoli
Toffoli, Daniele
Decleva, Piero
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Institute of Physics Publishing
Abstract
We analyze an angular dependence of the Wigner time delay near the Cooper minimum (CM) of the sub-valent ns shell in argon, krypton and xenon. Such an angular dependence is a result of interplay between the relativistic and correlation effects. The correlation with the outermost np valence shell induces a CM in the sub-valent ns shell which is otherwise CM free. A phase difference between the two spin-orbit split ionization continua Ep 1/2 and Ep 3/2 makes the Wigner time delay angular dependent. Both these effects are accounted for within relativistic formulations of the random phase approximation and the time-dependent density functional theory. Comparison between these two approaches illustrates a very strong sensitivity of the observed effect to the computation detail, especially the account of the ground state correlation
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Journal of Physics B: Atomic, Molecular and Optical Physics
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Journal article
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2099-12-31