Photoionization cross-sections of valence ns and np (n = 2,3) atomic shells in soft x-ray region

Chernysheva, L.V.; Yarzhemsky, V.G.

doi:10.1016/j.adt.2023.101621

Atomic Data and Nuclear Data Tables

2024

DOI: 10.1016/j.adt.2023.101621

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Photoionization cross-sections of valence ns and np (n = 2,3) atomic shells in soft x-ray region

L.V. Chernysheva,

V.G. Yarzhemsky

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2024

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Cited by 2 publications

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Photoionization cross-sections of valence shells of 3d-elements in VUV-soft X-ray spectral region

Chernysheva,

Yarzhemsky

2024

Atomic Data and Nuclear Data Tables

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Photoionization cross-sections of valence shells of 3d-elements in VUV-soft X-ray spectral region

Chernysheva,

Yarzhemsky

2024

Atomic Data and Nuclear Data Tables

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On a Study of Photoionization of Atoms and Ions from Endohedral Anions

Dolmatov,

Chernysheva,

Yarzhemsky

2024

Atoms

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We study the relationship between the results of two qualitatively different semi-empirical models for photoionization cross sections, σnℓ, of neutral atoms (A) and their cations (A+) centrally encapsulated inside a fullerene anion, CNq, where q represents the negative excess charge on the shell. One of the semi-empirical models, broadly employed in previous studies, assumes a uniform excess negative charge distribution over the entire fullerene cage, by analogy with a charged metallic sphere. The other model, presented here, considers the quantum states of the excess electrons on the shell, determined by specific n and ℓ values of their quantum numbers. Remarkably, both models yield similar photoionization cross sections for the encapsulated species. Consequently, we find that the photoionization of the encapsulated atoms or cations inside the CNq anion is influenced only slightly by the quantum states of the excess electrons on the fullerene cage. Furthermore, we demonstrate that the influence decreases even further as the size of the fullerene cage increases. All this holds true at least under the assumption that the encapsulated atom or cation is compact, i.e., its electron density remains primarily within itself rather than being drawn into the fullerene shell. This remarkable finding results from Hartree–Fock calculations combined with a popular modeling of the fullerene shell which is simulated by an attractive spherical annular potential.

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Photoionization cross-sections of valence ns and np (n = 2,3) atomic shells in soft x-ray region

Cited by 2 publications

References 21 publications

Photoionization cross-sections of valence shells of 3d-elements in VUV-soft X-ray spectral region

Photoionization cross-sections of valence shells of 3d-elements in VUV-soft X-ray spectral region

On a Study of Photoionization of Atoms and Ions from Endohedral Anions

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