Knowledge Bank

The lowest six vibrational hot bands of $CH+$ have been measured in a helium/$C2F6$ discharge by velocity modulation laser spectroscopy. A total of 56 transitions has been fit to a Dunham expansion for $v=0-7$, yielding the parameters: $\omega e=1792.6654(18)cm-1,Be=1.7204176(75)cm-1.Y20=-13.22968(54)cm-1$, and $D0=62086(5)cm-1$. The rotational temperature of $CH+$ in the plasma is near $650\circ K$ and the vibrational temperature is approximately $4500\circ K$.