Knowledge Bank

Oka detected the infrared absorption spectrum of $H+3$ in a hydrogen discharge using a difference frequency $laser.1$ In similar experiments, We report the observation of the $HeH+,20NeH+$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">22</mrow>}NeH+$ fundamental vibration-rotation bands of the $X1\Sigma +$ state. Some of the Observed molecular constants are $(incm-1,3\sigma uncertainties)$: $\upsilon 0B0D0B1D1HeH+2910.9568(19)33.55841(63)0.016210(37)30.83991(54)0.015869(31)\mathrm{<mrow\; data-mjx-texclass="ORD">20</mrow>}NeH+2677.8564(13)17.33821(28)0.002692(15)16.25525(33)0.002669(17)\mathrm{<mrow\; data-mjx-texclass="ORD">22</mrow>}NeH+2672.4971(15)17.26369(32)0.002664(19)16.18774(41)0.002641(20)$ The possibility of astrophysical detection of $HeH+$ will be discussed.