Calculation of Dissociative Attachment in HotO2
Calculation of Dissociative Attachment in HotO2
复制标题
HotO2 中解离附着的计算
DOI：
10.1103/physrev.155.59
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
T. F. O'Malley
中科院分区：
文献类型：
--
作者：
T. F. O'Malley
在假设振动(v)和旋转(r)态的麦克斯韦分布的情况下，通过半经验计算再现了在o2实验中发现的解离附着截面的非常显著的温度依赖性。采用最近导出的横截面σ v， r表达式，并对o2 -的终态电位曲线进行参数化以拟合实验结果。发现温度的变化是由快速变化的“生存概率”对激发振动状态的影响引起的，“生存概率”是衡量自电离和解离之间竞争的一个指标。计算的副产物是o2−*最终解离态的电位曲线，连同对其自电离宽度Γ a (R)的估计，以及该状态对振动激发和解离的电子能量损失的总横截面的贡献。
The very striking temperature dependence of the dissociative attachment cross sections found experimentally in O 2 has been reproduced by a semi-empirical calculation, assuming a Maxwell distribution of vibrational (v) and rotational (r) states. A recently derived expression for the cross section σ v, r is used, and the final-state potential curve of O 2− is parametrized to fit the experiments. The temperature shift is found to be caused by the effect on excited vibrational states of the rapidly varying" survival probability," a measure of the competition between auto-ionization and dissociation. Byproducts of the calculation are the potential curve for the final dissociating state of O 2−*, together with an estimate of its auto-ionization width Γ a (R), and also the contribution of this state to the total cross section for electron-energy loss to vibrational excitation and dissociation.