Laser photodetachment spectroscopy ofS−near theD1threshold

Abstract

A tunable, pulsed dye laser has been used to observe photodetachment from negative sulfur ions near the S(3 ${}_{}{}^1{}_{}{}^{}s$ channel threshold at 384.7 nm. The measured cross section is compatible with Wigner-law behavior over a range of 300 ${\mathrm{cm}}^{\mathrm{-}1}$. No resonance structure was observed. The ratio of the cross section for the ${}_{}{}^1{}_{}{}^{}\mathrm{D}$ channel to the cross section for the ${}_{}{}^3{}_{}{}^{}\mathrm{P}$ channel was measured to be 0.19(3) at an energy of 300 ${\mathrm{cm}}^{\mathrm{-}1}$ above the ${}_{}{}^1{}_{}{}^{}\mathrm{D}$ threshold.