Department of Physics, Sophia University, Tokyo 102-8554, Japan.
J Chem Phys. 2010 Feb 21;132(7):074309. doi: 10.1063/1.3319761.
We report absolute elastic differential, integral, and momentum transfer cross sections for electron interactions with the series of molecules CH(3)X (X=F, Cl, Br, I). The incident electron energy range is 50-200 eV, while the scattered electron angular range for the differential measurements is 15 degrees-150 degrees. In all cases the absolute scale of the differential cross sections was set using the relative flow method with helium as the reference species. Substitution effects on these cross sections, as we progress along the halomethane series CH(3)F, CH(3)Cl, CH(3)Br, and CH(3)I, are investigated as a part of this study. In addition, atomic-like behavior in these scattering systems is also considered by comparing these halomethane elastic cross sections to results from other workers for the corresponding noble gases Ne, Ar, Kr, and Xe, respectively. Finally we report results for calculations of elastic differential and integral cross sections for electrons scattering from each of the CH(3)X species, within an optical potential method and assuming a screened corrected independent atom representation. The level of agreement between these calculations and our measurements was found to be quite remarkable in each case.
我们报告了电子与 CH(X)（X=F、Cl、Br、I）系列分子相互作用的绝对弹性微分、积分和动量转移截面。入射电子能量范围为 50-200eV，而微分测量的散射电子角度范围为 15 度-150 度。在所有情况下，微分截面的绝对标度均使用氦作为参考物质的相对流动方法进行设置。在这项研究中，我们研究了随着卤代甲烷系列 CH(F)、CH(Cl)、CH(Br)和 CH(I)的进展，这些截面的取代效应。此外，通过将这些卤代甲烷弹性截面与相应的惰性气体 Ne、Ar、Kr 和 Xe 的其他研究人员的结果进行比较，还考虑了这些散射系统中的类原子行为。最后，我们报告了在光学势方法中，分别为电子从每个 CH(X)物质散射的弹性微分和积分截面的计算结果，同时假设屏蔽修正的独立原子表示。在每种情况下，这些计算与我们的测量结果之间的一致性都非常显著。
