Numbers refer to publications listed below.
The tritium atoms are inserted by generating them at high energies in a nuclear reaction. The noble gases are put in by heating the fullerenes in the presence of the gas at high temperatures and pressures or by shooting them in as ions or metastable atoms. The noble gas compounds can be detected by mass spectroscopy either as intact molecules or by decomposing them and detecting the noble gas. In the case of 3 He we can see the 3 He NMR signal. T he chief method used to make the noble-gas fullerene compounds is to heat fullerene in the presence of the gas at 650 o C and 3000 atm.