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arXiv physics/0604098physics.chem-phastro-ph
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电子与电子激发态O2分子碰撞的R矩阵计算

R-matrix calculation of electron collisions with electronically excited O2 molecules

Motomichi Tashiro, Keiji Morokuma, Jonathan Tennyson

摘要:

用固定键R矩阵方法研究了低能电子与O $_2$分子的碰撞.除了计算O-$_2$ ${X}^3Σ_{g}^-$基态外,还计算了O-$_2$的${a}^1Δ_{g}$和${b}^1Σ_{g}^+$激发态与电子碰撞的积分截面. O $_2$的13个目标电子态被包括在目标态的价构型相互作用表示内的模型中。${a}^1Δ_{g}$和${b}^1Σ_{g}^+$激发态的弹性截面与${X}^3Σ_{g}^-$基态的截面相似。与从${X}^3Σ_{g}^-$态激发的情况一样,$_2^-$ $Π_u$共振对来自${a}^1Δ_{g}$和${b}^1Σ_{g}^+$态的激发截面做出主要贡献。从${a}^1Δ_{g}$态到${b}^1Σ_{g}^+$态的激发截面的大小比从${X}^3Σ_{g}^-$到${b}^1Σ_{g}^+$态的相应截面大约10倍。对于这个${a}^1Δ_{g}$ $\to$ ${b}^1Σ_{g}^+$跃迁,我们在4.5 eV处的截面与现有的实验值吻合得很好。这些结果应该是重要的等离子体放电化学模型,往往需要之间的O $_2$的激发电子态的横截面。

英文摘要:

Low-energy electron collisions with O$_2$ molecules are studied using the fixed-bond R-matrix method. In addition to the O$_2$ ${X}^3Σ_{g}^-$ ground state, integrated cross sections are calculated for elecron collisions with the ${a}^1Δ_{g}$ and ${b}^1Σ_{g}^+$ excited states of O$_2$ molecules. 13 target electronic states of O$_2$ are included in the model within a valence configuration interaction representations of the target states. Elastic cross sections for the ${a}^1Δ_{g}$ and ${b}^1Σ_{g}^+$ excited states are similar to the cross sections for the ${X}^3Σ_{g}^-$ ground state. As in case of excitation from the ${X}^3Σ_{g}^-$ state, the O$_2^-$ $Π_u$ resonance makes the dominant contribution to excitation cross sections from the ${a}^1Δ_{g}$ and ${b}^1Σ_{g}^+$ states. The magnitude of excitation cross sections from the ${a}^1Δ_{g}$ state to the ${b}^1Σ_{g}^+$ state is about 10 time larger than the corresponding cross sections from the ${X}^3Σ_{g}^-$ to the ${b}^1Σ_{g}^+$ state. For this ${a}^1Δ_{g}$ $\to$ ${b}^1Σ_{g}^+$ transition, our cross section at 4.5 eV agrees well with the available experimental value. These results should be important for models of plasma discharge chemistry which often requires cross sections between the excited electronic states of O$_2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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