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Electron Attachment to CO_2 is Supercritical Ethane

机译:电子在CO_2上的附着是超临界乙烷

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摘要

Thermal electrons attach reversibly to CO_2 in supercritical ethane. The equilibrium constants range from 40 to 2 * 10~4 m~(-1) for pressures from 50 to 220 bar at 33 and 37 deg C. The attachment rate increases and the detachment rate decreases as the pressure increases. The lifetime of CO_2~- is between 20 and 100 ns in the high-pressure range. The reaction volume changes more than an order of magnitude, from -20.0 to -0.5 L/mol over the pressure and temperature ranges studied. The activation volume is approximately 50% of the reaction volume. Electrostriction volumes of the CO_2~- ion, calculated by a compressible continuum model, account for the main part of the observed reaction volumes. The calculation shows that the high-density region around each CO_2~- extends to 1 nm.
机译:热电子可逆地附着在超临界乙烷中的CO_2上。在33和37摄氏度下,压力从50到220 bar,平衡常数范围为40到2 * 10〜4 m〜(-1)。随着压力的增加,附着速率增加,脱离速率减小。在高压范围内,CO_2〜-的寿命在20到100 ns之间。在所研究的压力和温度范围内,反应体积从-20.0到-0.5 L / mol变化超过一个数量级。活化体积约为反应体积的50%。由可压缩连续体模型计算的CO_2-离子的电致伸缩体积占观察到的反应体积的主要部分。计算表明,每个CO_2〜-周围的高密度区域扩展到1nm。

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