Vacancy decay in endohedral atoms: the role of non-central position of the atom

Abstract

We demonstrate that the Auger decay rate in an endohedral atom is very sensitive to the atom's location in the fullerene cage. Two additional decay channels appear in an endohedral system: (a) the channel due to the change in the electric field at the atom caused by dynamic polarization of the fullerene electron shell by the Coulomb field of the vacancy, (b) the channel within which the released energy is transferred to the fullerene electron via the Coulomb interaction. % The relative magnitudes of the correction terms are dependent not only on the position of the doped atom but also on the transition energy $\om$. Additional enhancement of the decay rate appears for transitions whose energies are in the vicinity of the fullerene surface plasmons energies of high multipolarity. % It is demonstrated that in many cases the additional channels can dominate over the direct Auger decay resulting in pronounced broadening of the atomic emission lines. % The case study, carried out for Sc${}^{2+}$@C${}_{80}^{6-}$, shows that narrow autoionizing resonances in an isolated Sc${}^{2+}$ within the range $\om = 30... 45$ eV are dramatically broadened if the ion is located strongly off-the-center. % Using the developed model we carry out quantitative analysis of the photoionization spectrum for the endohedral complex Sc${}_3$N@C${}_{80}$ and demonstrate that the additional channels are partly responsible for the strong modification of the photoionization spectrum profile detected experimentally by Müller et al. (J. Phys.: Conf. Ser. 88, 012038 (2008)).

32 pages, 11 figures

References in corpus (5)

• Confinement resonances in photoionization of endohedral atoms: a myth or reality?
• On the vacancy decay in endohedral atoms
• Dynamical Screening of Atom Confined by Finite-Width Fullerene
• Dynamical screening of an endohedral atom
• Two center multipole expansion method: application to macromolecular systems

Cited by in corpus (5)

• Photoionization of ions with synchrotron radiation: From ions in space to atoms in cages
• Resonant Auger-intercoulombic hybridized decay in the photoionization of endohedral fullerenes
• First prediction of inter-Coulombic decay of C60 inner vacancies through the continuum of confined atoms
• Coherence of Auger and inter-Coulombic decay processes in the photoionization of Ar@C60 versus Kr@C60
• A density functional theory based comparative study of hybrid photoemissions from Cl@C60, Br@C60 and I@C60