ROTATIONAL SPECTRA OF (NO)N-14-O-17 AND (NO)N-15-O-18

The mm-wave spectra of N-15-O-18 and N-14-O-17 in both X2 PI1/2 and X2 PI3/2 states have been measured and assigned for the first time. Impr oved rotational and, for the first time, O-17 hyperfine coupling const ants have been derived from the analysis. The N-14-O-17 data yield par ameters of the unpaired electron spatial distribution near both nuclei . Furthermore, the deviation from the Born-Oppenheimer approximation i s confirmed on the basis of the rotational constants of five isotopome rs. Finally, when comparing the nuclear spin-rotation constants to the ones of other molecules containing N-14 or O-17 nuclei, a roughly lin ear proportionality with the rotational constant B is found.