Photoionization calculations of the endofullerene molecule Cl@C60 with an open-shell chlorine atom are performed in the time-dependent local density approximation (TDLDA) based on a spherical jellium model. Cross sections for atom-fullerene hybrid photoemission studied show the effects of the hybridization symmetry, the giant plasmon and the molecular cavity. Comparisons with the results of Ar@C60 provide insights in the role of a shell-closing electron and its influence on the dynamics. The results for Cl@C60 are further compared with those of a more stable, lower energy configuration that results after a C60 electron transfers to Cl forming Cl − @C60 + . This comparison reveals noticeable differences in the ionization properties of the antibonding hybrid state while the bonding hybrid remains nearly unaltered showing a magnification covering the entire giant plasmon energy range.

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