Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH_3 with H_3O^+
Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH_3 with H_3O^+
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紫外线诱导 NH_3 与 H_3O^ 酸碱反应在冰中形成铵离子的直接证据
DOI：
10.1088/0004-637x/713/2/906
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Kouchi
中科院分区：
文献类型：
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作者：
E-S. Moon;H. Kang;Y. Oba;N. Watanabe;A. Kouchi
我们提出了直接的证据，铵离子（nh4 +）形成通过紫外线（UV）光解nh3 - h2o混合物冰，不含酸。在紫外光解冰中，nh3与质子缺陷（h3o +）反应生成nh4 +。我们的观测可以解释星际冰中相对于nh4 +丰度的反阴离子的缺乏。此外，h3o +可能在紫外线照射环境下星际冰的酸碱化学中起重要作用。红外吸收结果表明，nh4 +是星际6.85 μm波段的潜在贡献者，但不是主要成分。
We present direct evidence for ammonium ion (NH 4+) formation through ultraviolet (UV) photolysis of NH 3–H 2 O mixture ice that does not contain acids. NH 4+ forms by the reaction of NH 3 with protonic defects (H 3 O+) in the UV-photolyzed ice. Our observations may explain the deficient counter-anions in interstellar ice relative to the abundance of NH 4+. Also, H 3 O+ may play an important role in the acid–base chemistry of interstellar ice in UV-irradiating environments. IR absorption results suggest that NH 4+ is a potential contributor to the interstellar 6.85 μm band but is not a dominant component.