Department of Physics, Sophia University, Tokyo 102-8554, Japan.
J Chem Phys. 2012 Apr 7;136(13):134313. doi: 10.1063/1.3699040.
We report absolute differential cross sections (DCSs) for elastic electron scattering from GeF(4). The incident electron energy range was 3-200 eV, while the scattered electron angular range was typically 15°-150°. In addition, corresponding independent atom model (IAM) calculations, within the screened additivity rule (SCAR) formulation, were also performed. Those results, particularly for electron energies above about 10 eV, were found to be in good quantitative agreement with the present experimental data. Furthermore, we compare our GeF(4) elastic DCSs to similar data for scattering from CF(4) and SiF(4). All these three species possess T(d) symmetry, and at each specific energy considered above about 50 eV their DCSs are observed to be almost identical. These indistinguishable features suggest that high-energy elastic scattering from these targets is virtually dominated by the atomic-F species of the molecules. Finally, estimates for the measured GeF(4) elastic integral cross sections are derived and compared to our IAM-SCAR computations and with independent total cross section values.
我们报告了 GeF(4)弹性电子散射的绝对微分截面 (DCS)。入射电子能量范围为 3-200 eV，而散射电子角度范围通常为 15°-150°。此外，还进行了相应的独立原子模型 (IAM) 计算，采用屏蔽加和规则 (SCAR) 公式。结果发现，特别是对于电子能量高于约 10 eV 的情况，这些结果与目前的实验数据具有良好的定量一致性。此外，我们将 GeF(4)弹性 DCS 与来自 CF(4)和 SiF(4)的散射的类似数据进行了比较。所有这三种物质都具有 T(d)对称性，在考虑的每个特定能量高于约 50 eV 的情况下，它们的 DCS 几乎相同。这些难以区分的特征表明，来自这些靶的高能弹性散射实际上主要由分子的原子-F 物种主导。最后，我们对测量的 GeF(4)弹性积分截面进行了估计，并将其与我们的 IAM-SCAR 计算以及独立的总截面值进行了比较。
