Knowledge Bank

Measurements were made on the emission from the $v\prime =3$ level of the $A2\Sigma +$ state of OH. Fluorescence scans were taken while exciting the 3-0 band with a tunable laser. The OH was generated in the burnt gases of a low pressure flame where collisions are infrequent enough that energy transfer does not complicate the spectra. Transition probabilities were obtained for $v\prime \prime =0$ to $v\prime \prime =5$. Values for the high vibrational levels of the $X2\Pi i$ state are important for determining the behavior of the electronic transition moment at large internuclear separation. LIF measurements are planned on the $v\prime =2$ and 4 levels of the A state.