Lifetimes and Quenching of the Ā ²A′(υ3′ = 0 – 2) → X ²A″ Fluorescence of HSO

Fluorescence lifetimes of vibrational levels of the first electronically excited state (Ā 2 A′) of HSO, determined by the technique of discharge flow and laser‐induced fluorescence, are 81 ± 10, 74 ± 8, and 76 ± 14 μs for υ 3 ′ = 0, 1 and 2, respectively. The rate coefficients of quenching of each level by He, N 2 , O 2 and O 3 were measured; the coefficients for HSO (Ā, υ 3 ′ = 0 – 2) quenched by O 3 arc 35–50 times as great as those of HSO by He.