The distorted-wave approximation is applied for h e first time to study Ihe electronic excitation of a non-linear plyatomic target by electron impact Specifically, differential and inregal crass seaions for lhe X 'AI -t 'Ac(%I -t 3sa1) transition in HzO are reported in the energy range of 12-30 eV. The comparison with Ihe available experimental and theoretical msu11s is encouraging.

In this work, we report on a theoretical study of electron-CS2 collision in the low- and intermediate-energy range. More specifically, the elastic differential and integral cross sections as well as the grand total (elastic+inelastic) cross sections in the 0.05-100 eV range are reported. A complex optical potential consisting of static, exchange, correlation-polarization plus absorption contributions, derived from a fully molecular wavefunction, is used for the electron-molecule interaction. The Schwinger variational iterative method combined with the distorted-wave approximation are applied to calculate the scattering amplitudes. The comparison between the calculated results and the existing experimental and theoretical results is encouraging.

In this paper, we report a joint theoretical-experimental study on electron-OCS collisions in the low-and intermediate-energy ranges. More specifically, elastic differential and integral cross sections, as well as grand total (elastic + inelastic) cross sections in the 0.4-600 eV energy range, are reported. A complex optical potential consisting of static, exchange, correlationpolarization plus absorption contributions, derived from a fully molecular wavefunction, is used for the electron-molecule interaction. The Schwinger variational iterative method, combined with the distorted-wave approximation, is applied to calculate the scattering amplitudes. Additionally, we also report measured elastic differential and integral cross sections in the 100-600 eV energy range determined using the relative-flow technique. Comparison between calculated results and present and existing experimental data, as well as with other theoretical results, is encouraging.

Recently we made calculations of differential and integral cross sections for the X1A1 to 3A1(3a1 to 3sa1) transition in H2O in the energy range of 12-30 eV, where the distorted-wave approximation was applied for the first time to study the electronic excitation of a nonlinear polyatomic target by electron impact. In the present work we make an extension of this calculation for that transition to the energy range 40-150 eV. Calculations of cross sections for the X1A1 to 3A1(3a1 to 3pa1) transition in the energy range 14-150 eV are also reported. The present study is the first theoretical investigation of electron-impact excitation of the channel 3a1 to 3pa1 in this nonlinear molecule.

A joint experimental-theoretical study on electron-SO 2 collisions in the low and intermediate energy range is reported. More specifically, experimental elastic differential, integral, and momentum transfer cross sections in absolute scale are measured in the 100-1000 eV energy range using the relative-flow technique. Calculated elastic differential, integral, and momentum transfer cross sections as well as grand-total and total absorption cross sections are also presented in the 1-1000 eV energy range. A complex optical potential is used to represent the electron-molecule interaction dynamics, whereas the Schwinger variational iterative method combined with the distorted-wave approximation is used to solve the scattering equations. Comparison of the present results is made with the theoretical and experimental results available in the literature.