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Various total cross sections for scattering of electrons by phosphorous triflouride (PF3) using the R-matrix method for incident energies from 0.1-15 eV and using spherical complex optical potential formalism beyond ionization threshold of target to 5000 eV are reported. We performed close-coupling calculations using static exchange plus polarization model. We employed different target models in order to study their relative dependence on the total cross sections. Three important structures are revealed in the total-cross-section curve: one that corresponds to the Ramsauer-Townsend minimum at 0.33 eV, the second is a strong maximum of 100 Ų at 1 eV, the third is around 11 eV corresponding to negative ion formation as predicted by earlier study. The total ionization cross sections are computed using the complex scattering potential ionization contribution method and the binary encounter Bethe method. The electronic-excitation cross sections, momentum-transfer cross sections, and differential and ionization cross sections are our maiden efforts for this system. We have compared our total-cross-section results with available theoretical and experimental results. [ABSTRACT FROM AUTHOR]

Theoretical rotationally elastic total cross sections for electron scattering from methanol over the incident energy range 0.1-2000 eV are presented. The computation of such cross sections for methanol is reported over such an extended energy range. We have employed two distinct formalisms to compute the cross sections across this energy range; between 0.1 eV and the ionization threshold of the target we have used the ab initio -matrix method, while at higher energies the spherical complex optical potential method is invoked. The results from both formalisms match quite well at energies where they overlap and hence imply that they are consistent with . each other. These total cross-section results are also in very good agreement with available experimental data and earlier theoretical data. The composite methodology employed here is well established and can be used to predict cross sections for other targets where data is scarce or not available. [ABSTRACT FROM AUTHOR]

We have used the ab initio R-matrix formalism at low impact energies (below the ionization threshold of the target) and the spherical complex optical potential methodology above the ionization threshold to generate total cross sections for e-SO2 scattering over the energy range from 0.1 to 2000 eV. The eigenphase diagram and total cross section indicate a structure at 3.4 eV which is ascribed to a shape resonance, evidence for which appears in earlier experimental studies. [ABSTRACT FROM AUTHOR]

This paper report results of calculation of the total cross section QT for electron impact on NH3, H2S, and PH3 over a wide range of incident energies from 0.01 eV to 2 keV. Total cross sections QT (elastic plus electronic excitation) for incident energies below the ionization threshold of the target were calculated using the UK molecular R-matrix code through the Quantemol-N software package and cross sections at higher energies were derived using the spherical complex optical potential formalism. The two methods are found to give self-consistent values where they overlap. The present results are, in general, found to be in good agreement with previous experimental and theoretical results. [ABSTRACT FROM AUTHOR]