Knowledge Bank

The high resolution infrared spectrum of the polar N$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$O dimer has been observed in the region of N-O stretching fundamental using a tunable diode laser to probe a pulsed supersonic slit jet. An a/b type hybrid band has been assigned and fitted to a planar asymmetric top with slipped parallel structure. The vibrational origin is measured to be 1290.2 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ showing a blue shift of 5.3 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ from the monomer band origin and 10.5 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ from the band origin of the non-polar isomer. The band for the non-polar isomer has also been remeasured and analysed in improved detail. In addition, two trimer bands of N$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$O, located at 1276.56 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ and 1285.78 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$, have been observed and assigned with a/c and a-type transitions, respectively.