Radiative Lifetimes and Total Transition Probabilities for Some Polyatomic Species

Radiative lifetimes have been measured in CS₂⁺, SO₂, C₂N₂, and N₂O⁺ systems using the phase‐shift technique and electron‐beam excitation. The measured lifetimes ranged from 12.2 ± 2.5 nsec for the SO₂ emission in the 2300–2700‐Å range to 294 ± 30 nsec for the ${\mathrm{CS}}_2^{+}{B}^2{\Sigma }_u^{+}{\mathrm{-X}}^2{\Pi }_{g^{-}}\mathrm{(i)}$ transition. The transitions ascribed to SO₂ and C₂N₂ show complications due to radiative cascading, while the CS₂⁺ and N₂O⁺ transitions observed were cascade free. These new data are discussed in light of prior spectroscopic results.