Theoretical study on electron collisions with SiF and SiF(2) radicals in the low- and intermediate-energy range

A theoretical study on electron collisions with SiF and SiF(2) radicals in the low- and intermediate-energy range is reported. More specifically, calculated elastic differential, integral, and momentum transfer cross sections as well as total and total absorption cross sections are presented in the 1-1000-eV energy range. A complex optical potential is used to represent the electron-radical interaction dynamics, whereas the iterative Schwinger variational method combined with the distorted-wave approximation is used to solve the scattering equations. Comparison of the present results with the available theoretical and experimental results in the literature is made.76

Absorption effects for electron-molecule collisions

In a recent work, we have proposed an empirical scaling factor to the quasi-free scattering model absorption potential of Staszewska et al., in order to account for many-body interactions in the electron-molecule scattering problem. In this work we extend the application of this modified potential to the study of electron collisions with three molecular targets of different geometric arrangements: linear (CO), angular (H2O), and tetrahedral (CH4), in a wide energy range. The calculations were performed using the same scaling factor without any additional adjustment. We have observed a significant improvement in the agreement between the calculated results and the experimental data available in the literature, in comparison with that of the calculated results without the scaling factor. Also, this study reinforces the fact that the proposed correction factor is independent of targets and therefore can be used for predictive purposes for a general target. (c) 2007 Elsevier B.V. All rights reserved.15941699303

Application of the scaled quasi-free scattering model absorption potential to electron scattering by CHx (x=1,2,3,4)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)In this work the newly derived scaling quasi-free scattering model (SQFSM) absorption potential is applied to electron-CHx (x=1-4) collisions in the intermediate energy range More specifically elastic differential integral grand-total (elastic plus inelastic) and total absorption cross sections are reported in the 15-500eV energy range A complex optical potential composed of static exchange correlation-polarization and our absorption potential contributions is used to represent the electron-molecule interaction dynamics whereas the iterative Schwinger variational method combined with the distorted-wave approximation is used to solve the scattering equations The comparison between our calculated results and the existing experimental and theoretical data in the literature is encouraging (C) 2010 Elsevier B V All rights reserved18241671410Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

A comparative experimental-theoretical study on elastic electron scattering by methane

Absolute differential cross sections for elastic electron scattering by methane have been measured at six incident electron energies between 5 and 100 eV and over scattering angles between 10 degrees and 180 degrees, using a crossed-beam electron spectrometer combined with a magnetic angle-changing device to extend the measurements to backward angles (125 degrees-180 degrees). Differential, integral and momentum-transfer cross sections are also calculated and reported for these energies. A complex optical potential was used to represent the electron-molecule interaction dynamics. The iterative Schwinger variational method combined with the distorted-wave approximation was used to solve the scattering equations. The comparison between our calculated and measured results, as well as with other experimental and theoretical data available in the literature, is encouraging.41