Fourier photospectroscopy of Xe@C₆₀through a Xe 4dresonance window: theory versus recent experiment

Abstract

The photoionization cross section of endohedral Xe@C60 over a Xe 4d giant resonance energy region, calculated in the time-dependent local density approximation, is compared with recent measurements (Kilcoyne et al 2010 Phys. Rev. Lett. 105 213001). An analysis based on the Fourier transforms of oscillatory cross sections is performed to derive a number of inherent similarities between the prediction and the data, including a large beating-type oscillation and several others of intermediate size. Results stress the need for more accurate measurements to access the wealth of information about the geometry of the system.

Sensitivity of cross sections to the diffuseness of the confining potential in time-dependent close-coupling calculations of the double photoionization of He@C60

“…However, we note that the photoelectron spectroscopy experiment of Rüdel et al [11] indicates a larger C 60 width of ∼3 a.u. A recent study [12] has also found indications of a 3-a.u. width in the experiment of Kilcoyne et al [2].…”

Electronic structure and dynamics of confined atoms

“…Nonetheless, it has been shown that these difficulties are relatively minor [72]. Furthermore, it has also been shown that the experimental data are consistent with the potential having rather sharp (although not discontinuous) edges [73]. Nevertheless, smoother interaction potentials for the endohedral atoms have been proposed to avoid possible problems.…”

“…Using the Fourier transform technique, a number of similarities and differences between the theoretical and experimental data were obtained in the work of [73].…”

The Ba 4d–4f giant dipole resonance in complex Ba/Si compounds

“…Although giant dipole resonances (GRs) in atoms and condensed matter have been studied intensively, [3,4,5,6] they have attracted a renewed interest in recent years. [7,8,9,10,11,12,13] Owing to the availability of highly intense synchrotron radiation and advanced experimental setups, new materials can be studied in which resonating atoms are embedded into fascinating complex environments like endohedral fullerenes or silicon based clathrates.…”

“…Indeed their findings showed reasonable agreement with calculations concerning oscillatory cross section by analysis in the Fourier reciprocal space. [8] Despite the extensive search for modulations of the GR by confinement effects as predicted by Luberek and Wendin, [17] experimental evidence of such modulations remains controversial. It was pointed out by Korol et al [25] that the displacement of the resonating atom within the cage due to either a static displacement, i.e.…”