Knowledge Bank

Intensity measurements have been made on flourescent emissioln from the $B3\Sigma u-$- state of $S2$, selectively excited using Hg line radiation. The ratio of the intensity I of a “satellite” branch (e.g., $TR31$) to that of a ``main” branch (e.g., $TR$) yields information on the triplet splitting parameter $\lambda$. In general, the satellites are weak if $\lambda$ is similar for both electronic states involved in the transition, but stronger if $\lambda$ is much different. The ratio $I(TR31)/I(R3)$ is $\sim$ 1.9 for emission from $v\prime =4,J\prime =13$, while the corresponding ratio for the $v\prime =1,J\prime =29$ level is . The conclusion that $\lambda (B,v\prime =1)$ is quite different from $\lambda (B,v\prime =4)$ is in accord with results from a previous comparison of satellite intensities for $J\prime$ near 40 in $v\prime =3$ and 4.