Gas-grain processes for the formation of CH4 and H2O:: Reactions of H atoms with C, O, and CO in the solid phase at 12 K
Gas-grain processes for the formation of CH4 and H2O:: Reactions of H atoms with C, O, and CO in the solid phase at 12 K
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DOI：
10.1086/305572
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发表时间：
1998-05-10
影响因子：
4.9
通讯作者：
Kihara, Y
中科院分区：
文献类型：
--
作者：
Hiraoka, K;Miyagoshi, T;Kihara, Y
通过程序升温质谱研究了 12 K 下固相中 H 原子与 C、O、CO 和 CH3CN 的反应。在H原子与CO基质中捕获的C原子的反应中，H原子在CO基质中迁移并选择性地与捕获的C原子反应形成CH4。 D2O 是 D 原子与 N2O 基质中捕获的 O 原子反应的主要产物。人们发现CH4是H原子与固体CO反应的最终产物之一。形成CH4的前体可能是CH2OH自由基。 H 原子与 CH3CN 的反应没有检测到产物，这表明腈基不适合 H 原子在 12 K 下的氢化反应。当 CH4 分子被捕获在 CH3OH 和 H2O 等基质中时，CH4 的解吸受到极大抑制，即，在 CH3OH 基质中，从纯 CH 的温度接近 50 K，CII 的温度接近 100 K，CH4 的温度接近 150 K。在 H2O 矩阵中。
The reactions of H atoms with C, O, CO, and CH3CN in solid phase at 12 K were investigated by temperature-programmed mass spectrometry. In the reaction of H atoms with C atoms trapped in the CO matrix, H atoms migrate in the CO matrix and react with trapped C atoms selectively to form CH4. D2O was the major product from the reactions of D atoms with O atoms trapped in a N2O matrix. CH4 was found to be one of the final products from the reactions of H atoms with solid CO. The precursor for the formation of CH4 may be the CH2OH radical. No products were detected from the reaction of H atoms with CH3CN, suggesting that the nitrile group is not amenable to the hydrogenation reactions by H atoms at 12 K. When CH4 molecules are trapped in matrices such as CH3OH and H2O, the desorption of CH4 is greatly suppressed, i.e., from similar to 50 K for neat CH, to similar to 100 K for CII, in the CH3OH matrix and to similar to 150 K for CH4 in the H2O matrix.