Photoionization of the Fullerene Ion C

Photoionization cross section of the fullerene ion C + 60 has been calculated within a single-electron approximation and also by using a consistent many-body theory accounting for many-electron correlations. Electronic wave functions of the ground and excited states have been determined within the jellium model based on the local density approximation. It is predicted a giant resonance in the photoionization cross section at the photon energy ∼ 25 eV. It is demonstrated that the resonance profile is much higher and narrower than in the case of the neutral fullerene C 60. Since the discovery till nowadays the fullerene C 60 attracts a permanent rapt attention of investigators. From the physical point of view an interest to this object is associated with its exotic hollow, but highly stable structure caused by a significant delocalization of a large number of valence electrons in this molecule. These features manifest themselves in a number of interesting physical phenomena occuring in collision processes involving fullerenes. For example, surface plasmon oscillations in the fullerene C 60 can be excited. The plasmon excitations have a profound collective nature and they influence significantly the formation of the cross sections in collisions of various kind involving fullerenes [1]. The plasmon excitations in the fullerene C 60 have been well investigated both experimentally and Usually, they manifest themselves as giant resonances in the excitation spectrum of C 60. In this connection, there arises a question on the possibility of excitation of the plasmon oscillations in fullerene C 60 ions of different multiplicity. Recently, the photoionization cross section of singly charged fullerene ion C + 60 has been measured [13]. However, theoretical calculation of this cross section has not been performed so far. In this work, for the first time, we have calculated the photoionization cross section of the fullerene ion C + 60 within the photon energy range from the C + 60 ionization threshold up to 40 eV. This energy range has been chosen, because the photoionization cross ‡ On leave from: