Effect of C60_{60} giant resonance on the photoabsorption of encaged atoms

The absolute differential oscillator strengths (DOS's) for the photoabsorption of the Ne, Ar, and Xe atoms encapsulated in the C$_{60}$ have been evaluated using the time-dependent-density-functional-theory, which solves the quantum Liouvillian equation with the Lanczos chain method. The calculations are performed in the energy regions both inside and outside the C$_{60}$ giant resonance. The photoabsorption spectra of the atoms encaged in the C$_{60}$ demonstrate strong oscillations inside the energy range of the C$_{60}$ giant resonance. This type of oscillation cannot be explained by the confinement resonance, but is due to the energy transfer from the C$_{60}$ valence electrons to the photoelectron through the intershell coupling

Rigorous negative-ion binding energies in low-energy electron elastic collisions with heavy multi-electron atoms and fullerene molecules: validation of electron affinities

Dramatically sharp resonances manifesting stable negative-ion formation characterize Regge pole-calculated low-energy electron elastic total cross sections (TCSs) of heavy multi-electron systems. The novelty of the Regge pole analysis is in the extraction of rigorous and unambiguous negative-ion binding energies (BEs), corresponding to the measured electron affinities (EAs) of the investigated multi-electron systems. The measured EAs have engendered the crucial question: is the EA of multi-electron atoms and fullerene molecules identified with the BE of the attached electron in the ground, metastable or excited state of the formed negative-ion during collision? Inconsistencies in the meaning of the measured EAs are elucidated.Comment: 16 pages and 5 Figures. Submitted to Atoms for publication. arXiv admin note: text overlap with arXiv:2207.0826

Photoionization of Ce3+^{3+} - Ce4+^{4+}

Photoionization of the Ce$^{3+}$ - Ce$^{4+}$ process has been studied using the random phase approximation with exchange method in the energy region 100-150 eV. Comparison of our results with the recent measurement [M\"uller {\it et al}, Phys. Rev. Lett. {\bf 101}, 133001 (2008)] confirms the suppression effect of the carbon cage in the endohedral fullerene Ce@C$_{82}^+$ photoionization. The reasons for the cause of the confinement resonance and the suppression effect are discussed.Comment: 9 pages, 2 figure