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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photodissociation of Nitrosobenzene and Decomposition of Phenyl Radical
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Photodissociation of Nitrosobenzene and Decomposition of Phenyl Radical

机译：亚硝基苯的光解离和苯基自由基的分解

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摘要

Photodissociation of nitrosobenzene in a molecular beam has been studied by multimass ion imaging techniques.Photodissociation at 248 nm shows that there is only one dissociation channel,i.e.,C_6H_5NO -- C_6H_5 + NO,regardless of the fact that the other channel,C_6H_5NO ->C_6H_4 + HNO,is energetically accessible in agreement with theoretically predicted results.Photodissociation at 193 nm also shows the same dissociation channel.However,about 10% of the C_6H_5 radicals produced at this wavelength further decomposed into benzyne and H atom,and the dissociation rates of phenyl radical as a function of internal energies were measured.The averaged photofragment translational energies released from the dissociation of nitrosobenzene at 193 and 248 nm are 10.2 and 6.9 kcal/mol,respectively,and fragment distributions are almost isotropic at both wavelengths.In addition,the thermal rate constant for dissociation of C_6H_5NO has been computed and compared with experimental data;the agreement between theory and experiment is excellent,confirming the most recently reported unusually high A-factor (>10~(17) s~(-1)).
机译：亚硝基苯在分子束中的光解离已经通过多质量离子成像技术进行了研究。在248 nm处的光解离显示只有一个解离通道，即C_6H_5NO-C_6H_5 + NO，无论另一个通道是C_6H_5NO-> C_6H_4 + HNO在能量上与理论预测结果一致。在193 nm处的光解离也显示相同的解离通道，但是，在该波长下产生的C_6H_5自由基约有10％进一步分解为苯并氢原子和解离速率测定亚硝基苯在193和248 nm处解离释放的平均光片段翻译能量分别为10.2和6.9 kcal / mol，并且碎片分布在两个波长下几乎都是各向同性的。计算出C_6H_5NO离解的热速率常数，并与实验数据进行比较;符合补间理论和实验非常出色，证实了最近报道的异常高的A因子（> 10〜（17）s〜（-1））。

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