Experimental verification on the applicability of the independent-atom model (IAM) for elastic electron-molecule scattering in the intermediate-energy range

Cross sections for elastic electron scattering by tetramethylsilane in the intermediate-energy range

“…Nevertheless, it overestimates the DCS near the lower-end of incident energies. This discrepancy is expected and has already been observed in other studies [18,22]. Moreover, the comparison between the IAM DCS calculated with and without accounting for the absorption effects show some discrepancies with each other.…”

“…The basic theory of the IAM approach has already been presented in our previous studies [18,22]. For the sake of completeness, it is outlined below.…”

“…On the other hand, the independent-atom-model (IAM) and additivity rule (AR) have shown to be effective to treat e − -molecule interaction in the energy range of hundreds of eV. However, their application is mostly focused at targets constructed by light atoms such as hydrogen, carbon, nitrogen, and oxygen [18,19]. The validity of such methods for targets that contain heavier atoms is still to be tested.…”

Cross Sections for Electron Collisions with Acetylene

“…After excluding those publications reporting the relative measurements and/or the cross sections with no uncertainties, only four reports relevant to this evaluation are available. These are Khakoo et al, 43 Iga et al, 44,45 and Gauf et al 42 However, the results of Khakoo et al 43 were superseded by the new measurements of Gauf et al 42 which are also from Khakoo's group. Therefore, in this evaluation, we considered only Iga et al 44,45 and Gauf et al 42 Iga et al reported experimental absolute elastic cross sections at nine electron energies in the (50-500 eV) energy range, and Gauf et al 42 at 13 electron energies in the (1-100 eV) energy range.…”

“…Therefore, we assume that the agreement assures the reliability of the cross section even in the low-energy region (below 50 eV) and high-energy region (above 100 eV) where there is only a single set of cross sections for each electron energy. For electron energies 50, 80, and 100 eV, we averaged two cross section sets from Iga et al 44,45 and Gauf et al 42 derived the recommended elastic differential and integral cross sections and the associated uncertainties. For other electron energies, we just recommended the original cross sections and the uncertainties of Iga et al 44,45 and Gauf et al 42 Complete numerical values for elastic differential cross sections (DCS's) are presented in Table 2, and the figures for six representative energies are in Fig.…”