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.

The electron-impact excitation and dissociation cross sections for the C 'Il", c 'll", 8' 'X"+, and E(F) 'Xg+ states of H2 have been calculated within the distorted-wave approximation. The distorted waves are obtained as solutions of the static-exchange potential field of the ground electronic state. Both differential and integral inelastic cross sections are reported and compared with other calculated results and available experimental data.

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Elastic differential and momentum transfer cross sections ae reported for electron scattering by HzO ai impact energies ranging from 4 to 50 eV. The iterative Schwinger vwiational merhod in the fixed-nuclei. static-exchange approximation is used to calculate the low partial wave scattering amplitudes and the higher partial wave contributions are included via closure using the Born approximation for a point-dipole, Comparison of our calculated cross sections with recent experimental and other theoretical results is encouraging.