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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Quenching of I(~2P_(1/2)) by Cl_2 and Cl Atoms over the Temperature Range 297-663 K
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Quenching of I(~2P_(1/2)) by Cl_2 and Cl Atoms over the Temperature Range 297-663 K

机译：297-663 K温度范围内Cl_2和Cl原子对I（〜2P_（1/2））的猝灭

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摘要

Time-resolved fluorescnece measurements have been used to examine the quenching of I(~2P_(1/2)) by Cl_2 and Cl atoms. Pulsed photolysis of CF_3I was used to generate I~*. Quenching by Cl_2 was examined using 248 nm photolysis as Cl_2 does not absorb significantly at this wavelength. Photolysis at 308 nm, which dissociates both CF_3I and Cl_2, was used to investigate quenching by Cl atoms. Quenching kinetics were characterized over the temperature range from 297 to 663 K. The rate constant for quenching by Cl atoms was found to be almost independent of temperature, whereas the rate constant for Cl_2 increased by 3 orders of magnitude in going from 297 to 663 K. Theoretical calculations show that quenching by cl atoms is mediated by a curve crossing process. The temperature dependence of the Cl_2 quenching rate constant is attributed to the reactive channel I~* + Cl_2 → ICl + Cl(~2P).
机译：时间分辨荧光测量已用于检查Cl_2和Cl原子对I（〜2P_（1/2））的猝灭。 CF_3I的脉冲光解被用来生成I〜*。 Cl_2的猝灭使用248 nm光解法进行了检查，因为Cl_2在该波长下没有明显吸收。在308 nm处进行光解，这会分解CF_3I和Cl_2，用于研究Cl原子的猝灭。在297至663 K的温度范围内表征了淬火动力学。发现Cl原子淬灭的速率常数几乎与温度无关，而Cl_2的速率常数从297升高至663 K增加了3个数量级。理论计算表明，cl原子的淬灭是由曲线交叉过程介导的。 Cl_2猝灭速率常数的温度依赖性归因于反应通道I〜* + Cl_2→ICl + Cl（〜2P）。

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