The parent ions of X@Ag54 dissociated as the collision energy increased. The main dissociation patterns corresponded to the radical cleavage of Ag-O3S t Bu and S-t Bu (Figure ). These dissociation patterns closely resembled those observed in the TGA curves. Furthermore, these dissociation reactions of both clusters occurred at similar collision energies (Figures and, Tables and), indicating that the stability of both clusters against CID was also similar each other.