ammonia 你了解多少？ Destruction mechanismsThere are 113 total proposed reactions leading to the destruction of NH3. Of these, 39 were tabulated in extensive tables of the chemistry among C, N, and O compounds.[35] A review of interstellar ammonia cites the following reactions as the principal dissociation mechanisms:[36] (1) NH3 + H3+ → NH4+ + H2 (2) NH3 + HCO+ → NH4+ + CO with rate constants of 4.39×10−9 [37] and 2.2×10−9,[38] respectively. The above equations (1,2) run at a rate of 8.8×10−9 and 4.4×10−13, respectively. These calculations assumed the given rate constants and abundances of [NH3]/[H2] = 10−5, [H3+]/[H2] = 2×10−5, [HCO+]/[H2] = 2×10−9, and total densities of n = 105, typical of cold, dense, molecular clouds.[39] Clearly, between these two primary reactions, equation (1) is the dominant destruction reaction, with a rate ~10,000 times faster than equation (2). This is due to the relatively high abundance of H3+. 查看更多15个回答 . 5人已关注
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