On the strong influence of inner shell resonances upon the outer shell photoionization of endohedral atoms
M. Ya. Amusia+*, L. V. Chernysheva+
*Racah Institute of Physics, Hebrew University, 91904 Jerusalem, Israel
+Ioffe Physical-Technical Institute RAS, 194021 St.-Petersburg, Russia
Abstract
It is demonstrated by the example of the Xe atom stuffed inside
the C60 fullerene, i.e. the endohedral Xe@C60, that the so-called
confinement resonances in 4d-subshell strongly affect the photoionization
cross-section of outer 5p- and subvalent 5s-electrons near 4d
ionization threshold.
It is a surprise that these narrow inner 4d shell resonances
are not smeared out in the outer shell photoionization cross-section. On the
contrary; the inner shell resonances affect the outer cross-section by
enhancing them enormously.
Close to its own photoionization thresholds, 5p and 5s photoionization cross-sections of
Xe@C60 are dominated by their own confinement resonances greatly affected by the
amplification of the incoming radiation intensity due to polarization by it of the C60 electron shell.
In between 4d- and 5p-thresholds, the effect of 4d is becoming stronger
while own resonances of 5p and 5s are becoming much less important.