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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Laser-Induced Decomposition of TNAZ
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Laser-Induced Decomposition of TNAZ

机译：TNAZ的激光诱导分解

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摘要

The initial decomposition products of 1,3,3-trinitroazetidine (TNAZ) are characterized using time-of-flight mass spectrometry. To induce thermal decomposition, solid samples of TNAZ are irradiated with 248 nm laser pulses. Products released to the gas phase are ionized by a pulse of 118 nm light, and the ions are detected using a time-of-flight mass spectrometer. neutral time-of-arrival scans are used to determine the translational temperature and the relative yields of the products. The translational temperature is found to depend linearly on the decomposition laser fluence, consistent with a photothermal decomposition mechanism. Analysis of the temperature dependence of the relative product yields shows that two reactions are important in the initial decomposition of TNAZ: unimolecular nitro-nitrite rearrangement followed by loss of NO and a bimolecular reaction generating nitrosodinitroazetidine (NDNAZ). Loss of NO_2 appears to be an early, but not initial, decomposition step. Experiments with isotopically labeled TNAZ show that the nitro-nitrite rearrangement occurs on the nitramine group and that NO_2 is lost from both the nitroalkyl and nitramine groups. NDNAZ is generated by replacement of the leaving nitramine nitro group by NO.
机译：1,3,3-三硝基氮杂环丁烷（TNAZ）的初始分解产物使用飞行时间质谱进行表征。为了引起热分解，用248 nm激光脉冲照射TNAZ的固体样品。释放到气相中的产物被118 nm的光脉冲电离，并使用飞行时间质谱仪检测离子。使用中性到达时间扫描来确定翻译温度和产物的相对产率。发现平移温度与分解激光能量密度线性相关，与光热分解机理一致。对相关产物收率的温度依赖性的分析表明，在TNAZ的初始分解中，有两个反应很重要：单分子亚硝酸盐重排，随后是NO的损失，以及生成亚硝基二硝基氮杂环丁烷（NDNAZ）的双分子反应。 NO_2的损失似乎是早期的分解步骤，而不是初始的分解步骤。用同位素标记的TNAZ进行的实验表明，亚硝酸盐亚硝酸盐的重排发生在硝胺基团上，并且硝化烷基和硝胺基团都损失了NO_2。 NDNAZ是通过用NO取代剩下的硝胺硝基而生成的。

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