Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan.
J Chem Phys. 2011 Feb 14;134(6):064311. doi: 10.1063/1.3533442.
We report measurements of differential and integral cross sections for electron excitation of the Schumann-Runge continuum, longest band, and second band electronic states in molecular oxygen. The energy range of the present study is 15-200 eV, with the angular range of the differential cross section (DCS) measurements from 2 to 130°. A generalized oscillator strength analysis is then employed in order to derive integral cross sections (ICSs) from the corresponding DCSs, and these ICSs are compared with relevant energy and oscillator strength scaled Born cross section (BEf-scaling [Y.-K. Kim, J. Chem. Phys. 126, 064305 (2007)]) results determined as a part of this investigation. Interestingly, while the present Schumann-Runge continuum and second band ICSs were in reasonable agreement with the respective BEf-scaling results, agreement for the longest band was poor below 100 eV with a possible reason for this apparently anomalous behavior being canvassed here. Finally, where possible all present data are compared with the results from earlier measurements and calculations with the level of agreement found being very good in some cases and marginal in others.
我们报告了电子激发分子氧的施曼-龙格连续谱、最长带和第二带电子态的微分和积分截面的测量结果。本研究的能量范围为 15-200 eV，微分截面（DCS）测量的角范围为 2 到 130°。然后采用广义振子强度分析，从相应的 DCS 中推导出积分截面（ICS），并将这些 ICS 与相关的能量和振子强度比例化的玻恩截面（BEf 缩放[Y.-K. Kim，J. Chem. Phys. 126, 064305 (2007)])结果进行比较，这些结果是作为本研究的一部分确定的。有趣的是，虽然目前的施曼-龙格连续谱和第二带 ICS 与相应的 BEf 缩放结果基本一致，但在 100 eV 以下，最长带的结果与 BEf 缩放结果相差较大，这里探讨了这种明显异常行为的可能原因。最后，在可能的情况下，将所有当前数据与早期测量和计算结果进行了比较，在某些情况下，一致性非常好，而在其他情况下则存在一定差距。
