Knowledge Bank

The 3$\nu 3$ band of nitrogen dioxide has been recorded between 4680 and $4775cm-1$ using a Fourier transform spectrometer with a resolution of $0.006cm-1$. The doublets resulting from the spin-rotation interaction have been observed for all che values of $Ka$. The four spin-rotation parameters $ϵxx,ϵyy,ϵzz,\eta zzzz$, have been adjusted to fit on the observed splittings. A Watson reduced Hamiltonian has been used in our rotational treatment. The fit of the vibrorotational lines has led to the determination of a set of accurate spectroscopic constants for the upper vibrational state.