Knowledge Bank

High-resolution laser excitation spectra of the $A2II-X2\Sigma +$ system have been obtained for the 0-0 through 3-0 bands of the two principal isotopomers of SrBr. The molecules were produced by reacting stontium vapor with methyl bromide in a Broida oven. A Coherent 699- 29 ring dye laser was used as a probe for both selective detection and resolved fluorescence. Perturbations of the $A2\Pi 1/2$ state with the closely lying $B2\Sigma +$ state, ($\sim 650cm-1$ higher in energy) are being characterized. An analysis of the ``crossing'' of the $v=3$ level of the A state with the $v=0$ level of the B state is required in order to obtain physically significant parameters.