Finally, we have included calculated spectra for a number of other isotopically labeled cyclobutadienes in Tables VI-IX. While Chapman6 has obtained spectra of two of these, their isotopic purity is such that a comparison with our calculated spectra is not possible.Acknowledgment. We should like to express our appreciation to the University Research Council, Vanderbilt University which provided travel funds and to the National Academy of Sciences for its endorsement of Dr. Carsky's visit. We are especially grateful to Kaara Ettesvold at the Academy for her efforts in our behalf. We also thank Dr. Peter Pulay for making his program Texas available to us.
Acknowledgment is made to the NSF (Grant No. CHE-76-16711 and CHE-79-21293) for partial support of this research, and M.A.R. gratefully acknowledges an NSF graduate fellowship.
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