Knowledge Bank

In a previous $work(1)$ indirect evidence from the spectrum of the $\nu 3$ band of $NH2+$ in the $X3B1$ ground electronic state has suggested that this ion is quasilinear. Analogous conclusion is obtained from ab initio $calculations(2)$. An important parameter for quantifying the quasilinear nature of $NH2+$ is the rotational constant A. More spectroscopic work and analysis on the quasilinearity of $NH2+$ will be reported. These concern: 1) our attempts to identify some unassigned rovibrational lines in the 3 $\mu$ region and to observe the $v2$ band. 2) the recent rovibrational ab initio calculations.