Knowledge Bank

A cw $Ar+$ laser divides 3 Watts of power among six UV lines ranging from 3336.14-3637.86 \AA, five of which excite analyzable fluorescence from CaO, SrO, CaS, SrS, and BaS. The sulfides are generated by reacting the metal entrained in argon with OCS. Observed excitations and fluorescence progressions are summarized on the next page. [FIGURE] New electronic states are designated by an asterisk. Fluorescence from BaO is also observed but too weak to assign. Four new electronic states are observed and vibrational numberings are determined or corrected for five states by comparing observed transition intensities against calculated Franck-Condon factors. Numerous perturbations are observed and intensity anomalies are more rule than exception, A detailed analysis of the BaS $A1\Sigma \sim a3\Pi$ and $A1\Sigma \sim A\prime \Pi$ perturbations combining the present laser fluorescence observations with the B-X and A-X $absorption1$ will be discussed.