ANALYSIS OF THE $A^{2}\Pi$ STATES OF $Sr^{79}Br$ AND $Sr^{81}Br$: DEPERTURBATION OF THE FIRST EXCITED STATE

Abstract

High-resolution laser excitation spectra of the $A^{2}II- X^{2}\Sigma^{+}$ 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 $A^{2}\Pi_{1/2}$ state with the closely lying $B^{2}\Sigma^{+}$ 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.