Photolysis of acetone at 193.3 nm
Photolysis of acetone at 193.3 nm
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丙酮在 193.3 nm 处的光解
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
M. Pilling
中科院分区：
文献类型：
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作者：
P. Lightfoot;S. Kirwan;M. Pilling
本文用最终产物分析和时间分辨吸收光谱研究了丙酮在193 nm单脉冲准分子激光光解过程中的光分解反应。乙烷是主要的产物，产生2CH/sub 3/ + CO的通道约占总光解的95%。建议下一个最重要的通道产生H + CH/sub 2/COCH/sub 3/（约3%）和CH/sub 4/ + CH/sub 2/CO（/约lt/ 2%）。时间分辨实验未能检测到乙酰基在一个约。1-ms的时间尺度，表明它们的产率<甲基自由基的产率的1%。乙烯产率随激光能量的增加呈非线性增加，这一观察结果归因于振动激发的甲基自由基的二次光解产生CH/sub 2/ + H。实验表明，193-nm激光光解是一种清洁的甲基自由基的来源。
The photodecomposition of acetone by single-pulse excimer laser photolysis at 193 nm has been studied by using end product analysis and time-resolved absorption spectroscopy at 300 and 600 K and as a function of helium pressure. Ethane is the dominant product and the channel producing 2CH/sub 3/ + CO accounts for about 95% of the overall photolysis. It is suggested that the next most important channels produce H + CH/sub 2/COCH/sub 3/ (approx. 3%) and CH/sub 4/ + CH/sub 2/CO (/approx lt/ 2%). Time-resolved experiments failed to detect acetyl radicals on a approx. 1-ms time scale, demonstrating that their yield is < 1% of that of the methyl radical. The ethylene yield increases nonlinearly with laser energy, an observation attributed to secondary photolysis of vibrationally excited methyl radicals to yield CH/sub 2/ + H. The experiments demonstrate that 193-nm laser photolysis is a clean source of methyl radicals.