Abstract
A redetermination of the radiative lifetime of the long-lived B3Π(Ou+)state of 35Cl35Cl is described. Pulses of narrow-band radiation from a scanning dye laser (> 1 mJ pulse–1) were used to excite the v′= 5, J′= 16 state of Cl2(B). Decay of fluorescence in real time was used to determine τR for the v′= 5 state: τR=(305 ± 15)µs (1σ). Reasons for error in previous work are discussed. The long radiative lifetime of Cl2(B) is consistent with estimates based on absorption coefficient measurements in the ultraviolet continuum of Cl2.
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