Knowledge Bank

A difference frequency laser spectrometer along with velocity modulation detection was used to record the spectrum, between 3500 and $2900cm-1$, of an AC glow discharge with a gas mixture of $N2/H2$/He. Although the gas mixture was choosen to optimize the $NH2+$ signals, several ammonia cation lines are also present in the spectrum. Our observation of the $v2+v3\leftarrow v2$ band is to be added to the previous studies of the $v3\leftarrow 0$ and $v2\leftarrow 0$ $bands1-2$ of $NH3+$. The results of our analysis will be presented. Our attempt to identify the $v3+v4\leftarrow v4$ band will also be reported.