Abstract
Several microwave transitions of O 15N…NO 2 and ON… 15NO 2 have been measured under high resolution using a pulsed-nozzle Fourier transform spectrometer. The 14N quadrupole coupling constants in the inertial axis system have been determined for both nitrogen atoms. The quadrupole coupling constants for ON … 15NO 2 are eQq aa = −0.5203(20) and eQq bb = −4.1981(19) MHz, and for O 15N…NO 2 are eQq aa = −1.7999(13) and eQq bb = 0.0808(17) MHz. The 14N quadrpole coupling constants determined by Kukolich for the main species ON…NO 2 should be reversed with respect to the NO and NO 2 groups. Combining the present data with the main species constants allows the complete quadrupole coupling tensor to be estimated for the NO 2 group; the tensor in N 2O 3 lies within 2° of the N…N bond direction and within 0.4° of the bisector of the ONO angle. Spin-rotation effects are significant for nitrogen in the NO group; C aa is determined to be 8 ± 2 kHz for 14N in ON… 15NO 2 and −15 ± 3 kHz for 15N obtained directly from splittings in the spectrum of O 15N… 15NO 2.
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