PERMUTATION-INVERSION GROUP OF FULLERITE C-70 IN THE INTERMEDIATE PHASE

The permutation-inversion symmetry group of fullerite C-70 in the inte rmediate phase (at tempera tures 270 K < T < 340 K) and the permutatio n-inversion site symmetry group of a rotating molecule C-70 in a nonri gid crystal are generated. Their irreducible representations compatibl e with the principle of symmetry of wave functions with respect to the permutations of identical nuclei are found. Group-theoretical classif ication of quantum-mechanical states of a rotating molecule and a crys tal in the intermediate phase of fullerite C-70 is made. The selection rules for electronic and IR spectra in terms of the irreducible repre sentations of the permutation-inversion group are found.