Dramatic distortion of the 4d giant resonance by the C₆₀fullerene shell

Abstract

A. Multielectron Correlation Effects in Collisions A.1. Probing Correlations through Spin-Orbit InteractionRecently, a new aspect of interchannel coupling has been found [1], known as spin-orbit activated interchannel coupling, stimulated by an experimental study on photoionization of Xe in the vicinity of the 3d threshold. This effect results only through the spin-orbit splitting of innershell thresholds. Effects of spin-orbit activated interchannel coupling on nondipole [2] photoelectron angular distribution asymmetry parameters have been discussed, including the spin-polarization of photoelectrons from 3d electrons of Xe, Cs and Ba, concluding that through spin-orbit interaction polarization can be achieved and correlation probed.Public reporting burden for this collection of information is estimated to average 1 hour per response, including ii is, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send'

Confinement Resonances in Photoionization ofXe@C60+

“…3, which is attributed to the excess cross section due to the presence of Xe inside the C 60 cage. Plotted for comparison are the RPAE calculations of cross sections for 4d photoionization of a free Xe atom [8], and for photoionization of Xe@C 60 predicted by Amusia et al for a spherical shell of radius 0.362 nm and zero thickness [5] and by Dolmatov and Manson for a shell of radius 0.307 nm and thickness of 0.105 nm [11]. Also shown is the TDLDA calculation of Madjet et al [14].…”

“…When a caged atom is photoionized, the emitted electron wave may be reflected by the cage, giving rise to multipath interference [3] and confinement resonances [4]. This led to a prediction by Amusia et al [5,6] based on the random phase approximation with exchange (RPAE) method that the well-known broad, giant 4d photoionization resonance in the Xe atom [7-9] would be significantly modulated in endohedral Xe@C 60 . Strong oscillations in the energy dependence of the photoionization cross section are predicted, producing four maxima while preserving an oscillator strength of 10 corresponding to the filled Xe 4d subshell.…”

“…Error bars are statistical, representing 1 standard deviation from the mean. Plotted for comparison are RPAE theoretical cross sections for 4d photoionization of free Xe [8] (solid curve in black), and of Xe in a C 60 cage of zero thickness (dashed curve in blue) [5] and a cage of finite thickness (dotted curve in red) [11]. The TDLDA calculation for Xe@C 60 is shown by the dash-dotted curve in green [14].…”

Generalized oscillator strength of endohedral molecules

“…The credibility of RPAE is well established for atoms [6], while the reasonable accuracy of the zero-thickness potential at least in obtaining qualitative predictions is confirmed by comparing the calculation [16] and measured [17] data for 4d subshell of Xe@C 60 .…”

Off-center effect on the photoabsorption spectra of encapsulated Xe atoms

“…In the photoionization studies of endohedral fullerenes the most attractive problem is the Xe 4d giant resonance of the Xe@C 60 molecule [4][5][6][7][8][9]. The advantage of studying the Xe@C 60 photoionization is that the Xe atom can be assumed to be located at the center of the C 60 .…”