Abstract
The rotational spectrum of 13C isotopically enriched diazirine, H213C14N2, has been recorded in the region between 12 and 250 GHz. From an analysis of the nuclear hyperfine structure of the rotational transitions, quadrupole coupling and spin-rotational constants have been determined. Using Watson's A-reduced Hamiltonian, the rotational constants, the quartic and some sextic centrifugal distortion constants have been obtained for the ground vibrational state. The rotational constants obtained areThe nuclear quadrupole coupling constants and the spin-rotation constants arefor the two identical quadrupolc nitrogen nuclei. The accuracy of the constants obtained allows us to evaluate the line positions and hyperfine structure of any rotational transition in the microwave and millimetre wave region.
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