Study of CuxC60 film UV-Vis absorption spectrum

in this paper, the formation of the CuxC60 films has been described briefly. The UV-Vis absorption spectrum of CuxC60 film have been discussed in detail, the electronic structure of CuxC60 film is discussed qualitatively. For x < 1, there exists only Cu+ in the CuxC60 films. However, for x = 4, not only Cu+, but also atom-Cu exists in them. In CuxC60 films three strong peaks have been shiffed compared with that of C-60 films. The shift of these strong peaks shows that in the CuxC60 films C-60 molecule accepts only one electron and becomes C-60. Because of the existence of the atom-Cu in the CuxC60 films, in visible region there is a wide peak which is the plasmons resonance absorb peak of the Cu-cluster in it.