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Photodetachment Imaging Studies of the Electron Affinity of CF_3

机译:CF_3电子亲和力的光解成像研究

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摘要

The photoelectron spectra of the trifluoromethyl anion, CF_3, at 355 and 258 nm are reported. Simulation of the partially resolved vibrational structure is used to extract the adiabatic electron affinity, AEA[CF31 = 1.82+-0.05 e V. The heat of formation for thetrifluoromethyl anion derived from the adiabatic electron affinity(#delta#H_(f,298)~0= -153.4 +-1.5 kcal/mol) is compared to the high-accuracy .'isodesmic bond additivity corrected" (BAC) complete basis set (CBS-Q) theory prediction (#delta#H_(f,298)~0[CF_3] .= -152.6 kcal/mol). We find the C~S-Q prediction of #delta#H_(f,298)~0 [CF3] = -112.1 kcal/mol, after BAC,to be in excellent agreement with the most recent experimental detennination of the radical heat of formation. The photoelectron angular distribution at 355 nm was also extracted from the photoelectron image, revealing p wave photodetachment with an energy-averaged anisotropy parameter of.8 = 1.5 +-0.1.
机译:报告了三氟甲基阴离子CF_3在355和258 nm的光电子能谱。通过模拟部分解析的振动结构来提取绝热电子亲和力AEA [CF31 = 1.82 + -0.05 eV。由绝热电子亲和力得出的三氟甲基阴离子的形成热(#delta#H_(f,298)将〜0 = -153.4 + -1.5 kcal / mol)与高精度“校正的等当键加性”(BAC)完全基集(CBS-Q)理论预测(#delta#H_(f,298)〜 0 [CF_3]。= -152.6 kcal / mol)。我们发现BAC后#delta#H_(f,298)〜0 [CF3] = -112.1 kcal / mol的C〜SQ预测非常吻合用最新的实验来确定形成的自由基的热量,还从光电子图像中提取了355 nm处的光电子角分布,揭示了p波光解离,其能量平均各向异性参数为8 = 1.5 + -0.1。

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