Knowledge Bank

Fourier transform spectra of the emission of $NH2$ have been recorded at high resolution using a Bomem spectrometer. In the special range $2600-3500cm-1$, transitions of the vibrational fundamental $\nu 1$ of $NH2$ are observed as well as the $\nu 1$ and $\nu 3$ fundamentals of $NH3$ and the $\Delta v=1$ sequence of NH in its $X3\Sigma -$ electronic ground state. Only a few weak lines of the 110 - 010 band can be detected and no lines of the fundamental $\nu 3$ have been identified. Between 6000 and $10000cm-1$, the emission arises from the electronic transition $A~2A1-X~2B1$ of $NH2$; the lines involve the lowest vibronic states of each $Ka$ value in the upper $A~2A1$ state and the 020 or 030 vibrational levels in the $X~2B1$ lower state. From the rotational analyses, improved molecular constants will be presented.