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30 keV  111m Cd and 50 keV  199m Hg beams from ISOLDE were used to implant on preformed targets of C 60  with a thickness of 1 mg cm -2 . Endofullerene compounds, viz.  111m Cd@C 60  and  199m Hg@C 60  formed during implantation were separated by filtration through micropore filter paper followed by solvent extraction. Dried samples of the endofullerene compounds were counted for the time differential perturbed angular correlation (TDPAC) measurement using the coincidence of the 151 - 245 keV cascade of  111m Cd and the 374 - 158 keV cascade of  199m Hg on a six LaBr 3 (Ce) detector system coupled with digital electronics. The results for  111m Cd@C 60  indicate a single static component (27%) and a fast relaxing component (73%), the latter implying that the cadmium atom moves rapidly inside the cage at room temperature. The quadrupole interaction frequency and asymmetry parameter of the cadmium atom occupying the static site in C 60  are w Q =8.21(36) Mrad s -1  and η = 0.41(9), respectively. The fast relaxation constant is 0.0031(4) ns -1 . Similarly, mercury atoms also exhibit a single static and a fast component. The static site has a quadrupole frequency w Q =283.0(12.4) Mrad s -1  and η =0 with a fraction of 30%. The fast relaxation constant is 0.045(8) ns -1  with a fraction of 70%, very similar to that of cadmium.

Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C 60 Fullerene Cage