用快电子碰撞研究一氧化二氮价壳层激发的截面。

Cross sections for the valence shell excitations of nitrous oxide studied by fast electron impact.

机构信息

Department of Modern Physics, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.

出版信息

J Chem Phys. 2010 Mar 28;132(12):124301. doi: 10.1063/1.3360311.

DOI:10.1063/1.3360311

PMID:20370117

Abstract

The generalized oscillator strengths, differential cross sections, as well as the integral cross sections for electron impact excitation of the B (1)Delta, C (1)Pi, and D (1)Sigma(+) states of N(2)O have been determined at an incident electron energy of 2500 eV. A generalized oscillator strength analysis reveals that the B (1)Delta<--X (1)Sigma(+) transition is dominated by the quadrupolar component. From the comparison to the previous experimental results, it is found that the first Born approximation is not satisfied for the C (1)Pi excitation while it is valid for the D (1)Sigma(+) excitation at an incident electron energy of 200 eV. The BE-scaled integral cross section for the B (1)Delta excitation from its threshold to 5000 eV was calculated based on its generalized oscillator strength, and the present integral cross sections for the excitation of the C (1)Pi and D (1)Sigma(+) states are in good agreement with the calculations using the BEf-scaling approach.

摘要

在 2500eV 的入射电子能量下，确定了 N2O 的 B(1)Δ、C(1)Π和 D(1)Σ+(+)态的电子碰撞激发的广义振子强度、微分截面以及积分截面。广义振子强度分析表明，B(1)Δ<--X(1)Σ+(+)跃迁主要由四极分量主导。通过与以前的实验结果进行比较，发现对于 C(1)Π激发，第一玻恩近似不成立，而对于 D(1)Σ+(+)激发，在 200eV 的入射电子能量下成立。基于其广义振子强度，计算了从其阈值到 5000eV 的 B(1)Δ激发的 BE 标度积分截面，并且对于 C(1)Π和 D(1)Σ+(+)态激发的本积分截面与使用 BEf 标度方法的计算结果非常吻合。