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  • 1 The University of Arizona Department of Chemistry 85721 Tucson AZ (USA)
  • | 2 Czechoslovak Academy of Sciences Institute of Physical Chemistry and Electrochemistry Prague Czech and Slovak Federal Republic
  • | 3 Charles University Faculty of Science Prague 2 Czech and Slovak Federal Republic
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Isotopic rules are studied for calculated vibrational frequencies of all possible 7212C/13C isotopomers of the C7 cluster of the C2v symmetry. The isotopomers can undergo 486 isomerizations which are decomposed into 27 subclasses using properties of sums of the squares of the vibrational frequencies.