Aluminum atoms are injected into planetary upper atmospheres by meteoric ablation. Rapid oxidation of Al by O₂ to form AlO is then likely to be followed by reactions with O₃, O₂, and CO₂ to form larger oxides and carbonates, which can also be reduced by atomic O and CO. The reactions listed below were investigated experimentally using both pulsed laser photolysis of an Al precursor in a slow flow reactor, and pulsed laser ablation of an Al target in a fast flow tube, with laser-induced fluorescence detection of AlO. The experimental results were interpreted using electronic structure theory calculations and Rice–Ramsperger–Kassel–Markus theory. The low pressure limiting rate coefficients for the two recombination reactions are: log₁₀(k_rec,0 (AlO + O₂ + N₂, 192–812 K)) = −35.137 + 6.1052 log₁₀(T) – 1.4089 (log₁₀(T))² and log₁₀(k_rec,0(AlO + CO₂ + N₂, 193–813 K)) = −38.736 + 8.7342 log₁₀(T) – 2.0202 (log₁₀(T))² cm⁶ molecule^–2 s^–1, with a ±20% uncertainty over the experimental temperature range. The following bimolecular reactions were also studied at 295 K: k(AlO + O₃ → OAlO + O₂) = (1.25 ± 0.19) × 10^–10; k(AlO + CO → Al + CO₂) = (1.95 ± 0.35) × 10^–12; k(OAlO + CO → AlO + CO₂) = (2.6 ± 0.7) × 10^–11 and k(OAlO + O → AlO + O₂) = (1.9 ± 0.8) × 10^–10 cm³ molecule^–1 s^–1. In the terrestrial atmosphere between 65 and 110 km, AlO is mostly removed by recombination with O₂ below 85 km, and reaction with O₃ above 90 km. On Mars, recombination with CO₂ is much more important than with O₂, although reduction of AlO by CO should maintain a significant density of Al atoms. Here we show that in both atmospheres, AlOH is likely to be an important reservoir.

中文翻译：

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AlO和OAlO与行星中间层反应的动力学研究

铝原子通过流平烧蚀注入到行星高层大气中。然后O ₂会迅速将Al氧化成AlO，然后与O ₃，O ₂和CO ₂反应形成较大的氧化物和碳酸盐，也可以通过原子O和CO还原。下面列出的反应使用慢流反应器中的Al前驱物进行脉冲激光光解和快速流管中的Al目标的脉冲激光烧蚀，以及激光诱导的AlO荧光检测，进行了实验研究。实验结果用电子结构理论计算和莱斯-拉姆斯伯格-卡塞尔-马库斯理论来解释。两个重组反应的低压极限速率系数为：log₁₀（ķ _REC，0（ALO + O ₂ + N ₂，192-812 K））= -35.137 + 6.1052日志₁₀（Ť） - 1.4089（日志₁₀（Ť））²和日志₁₀（ķ _REC，0（的AlO + CO ₂ + N ₂，193-813 K））= -38.736 + 8.7342日志₁₀（Ť） - 2.0202（日志₁₀（Ť））²厘米⁶分子^-2小号^-1，在实验温度范围内具有±20％的不确定度。还研究了在295 K下的以下双分子反应：k（AlO + O ₃ →OAlO + O ₂）=（1.25±0.19）×10 ^–10；k（AlO + CO→Al + CO ₂）=（1.95±0.35）×10 ^–12；k（OAlO + CO→AlO + CO ₂）=（2.6±0.7）×10 ^–11，k（OAlO + O→AlO + O ₂）=（1.9±0.8）×10 ^–10 cm ³分子^–1 s ^{– 1个}。在65至110 km之间的陆地大气中，AlO大部分通过与85 km以下的O ₂重组以及与90 km以上的O _3的反应而去除。在火星上，与CO _2的复合比与O _2的复合要重要得多，尽管通过CO还原AlO应该可以保持很大的Al原子密度。在这里，我们表明在两种大气中，AlOH可能是重要的储层。