  Considering the photoionization of Ar@C60, we predict resonant femtosecond
decays of both Ar and C60 vacancies through the continua of atom-fullerene
hybrid final states. The resulting resonances emerge from the interference
between simultaneous autoionizing and intercoulombic decay (ICD) processes. For
Ar 3s-->np excitations, these resonances are far stronger than the Ar-to-C60
resonant ICDs, while for C60 excitations they are strikingly larger than the
corresponding Auger features. The results indicate the power of hybridization
to enhance decay rates, and modify lifetimes and line profiles.
