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Nickel atoms are injected into the Earth's mesosphere by meteoric ablation, producing a Ni layer between 70 and 105 km in altitude. The subsequent reactions of Ni and NiO with atmospherically relevant species were studied using the time-resolved pulsed laser photolysis-laser-induced fluorescence technique, combined with electronic structure calculations and RRKM theory where appropriate. Results for bimolecular reactions (in cm 3 molecule -1 s -1 ): k(Ni + O 3 , 293 K) = (6.5 ± 0.7) × 10 -10 ; k(NiO + O 3 → Ni + 2O 2 , 293 K) = (1.4 ± 0.5) × 10 -10 ; k(NiO + O 3 → NiO 2 + O 2 , 293 K) = (2.5 ± 0.7) × 10 -10 ; k(NiO + CO, 190-377 K) = (3.2 ± 0.6) × 10 -11 ( T/200) -0.19±0.05 . For termolecular reactions (in cm 6 molecule -2 s -1 , uncertainty ± σ over the stated temperature range): log 10 ( k rec,0 (Ni + O 2 + N 2 , 190-455 K)) = -37.592 + 7.168log 10 ( T) - 1.5650(log 10 ( T)) 2 , σ = 11%; log 10 ( k rec,0 (NiO + O 2 + N 2 , 293-380 K)) = -41.0913 + 10.1064log 10 ( T) - 2.2610(log 10 ( T)) 2 , σ = 22%; and log 10 ( k rec,0 (NiO + CO 2 + N 2 , 191-375 K)) = -41.4265 + 10.9640log 10 ( T) - 2.5287(log 10 ( T)) 2 , σ = 15%. The faster recombination reaction NiO + H 2 O + N 2 , which is clearly in the falloff region over the experimental pressure range (3-10 Torr), is best described by log 10 ( k rec,0 /cm 6 molecule -2 s -1 ) = -29.7651 + 5.2064log 10 ( T) - 1.7118(log 10 ( T)) 2 , k rec,∞ = 6.0 × 10 -10 exp(-171/ T) cm 3 molecule -1 s -1 , broadening factor F c = 0.84, σ = 16%. The implications of these results in the atmosphere are then discussed.

Kinetic Study of Ni and NiO Reactions Pertinent to the Earth’s Upper Atmosphere