Molecular structure of norbornadiene as determined by microwave Fourier transform spectroscopy

The rotational spectra of six 13 C and D isotopomers of norbornadiene have been measured between 12 and 25 GHz. The Fourier transform technique has been instrumental in observing the weak transitions of the norbornadienes because of the small permanent electric dipole moment. By combining the results from a previous study of norbomadiene, the complete substitution structure has been determined from the rotational constants of the parent and six isotopic species