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• W2000540287 abstract "A laser flash photolysis–resonance fluorescence technique has been employed to measure rate coefficients and physical vs. reactive quenching branching ratios for O( 1 D) deactivation by three potent greenhouse gases, SO 2 F 2 ( k 1 ), NF 3 ( k 2 ), and SF 5 CF 3 ( k 3 ). In excellent agreement with one published study, we find that k 1 (T) = 9.0 × 10 -11 exp(+98/T) cm 3 molecule -1 s -1 and that the reactive quenching rate coefficient is k 1 b = (5.8 ± 2.3) × 10 -11 cm 3 molecule -1 s -1 independent of temperature. We find that k 2 (T) = 2.0 × 10 -11 exp(+52/T) cm 3 molecule -1 s -1 with reaction proceeding almost entirely (∼99%) by reactive quenching. Reactive quenching of O( 1 D) by NF 3 is more than a factor of two faster than reported in one published study, a result that will significantly lower the model-derived atmospheric lifetime and global warming potential of NF 3 . Deactivation of O( 1 D) by SF 5 CF 3 is slow enough ( k 3 < 2.0 × 10 -13 cm 3 molecule -1 s -1 at 298 K) that reaction with O( 1 D) is unimportant as an atmospheric removal mechanism for SF 5 CF 3 . The kinetics of O( 1 D) reactions with SO 2 ( k 4 ) and CS 2 ( k 5 ) have also been investigated at 298 K. We find that k 4 = (2.2 ± 0.3) × 10 -10 and k 5 = (4.6 ± 0.6) × 10 -10 cm 3 molecule -1 s -1 ; branching ratios for reactive quenching are 0.76 ± 0.12 and 0.94 ± 0.06 for the SO 2 and CS 2 reactions, respectively. All uncertainties reported above are estimates of accuracy (2 σ ) and rate coefficients k i (T) ( i = 1,2) calculated from the above Arrhenius expressions have estimated accuracies of ± 15% (2 σ )." @default.
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• W2000540287 date "2010-02-04" @default.
• W2000540287 modified "2023-09-25" @default.
• W2000540287 title "Reactive and nonreactive quenching of O( ¹ D) by the potent greenhouse gases SO ₂ F ₂ , NF ₃ , and SF ₅ CF ₃" @default.
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• W2000540287 doi "https://doi.org/10.1073/pnas.0911228107" @default.
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