Vibrational excitation of H2O by electron impact

We present results for the vibrational excitation of H2O by low-energy elec trons (< 10 eV). We calculate differential cross sections for the first exc ited states for all three modes using an R-matrix approach, at the static-e xchange level, and the Chase approximation. Correction to the scattering am plitude for all partial waves (l > 3) is made using a closure approximation . The results are consistent with other theoretical treatments. For the ben ding mode there is agreement with two older experiments but disagreement wi th a more recent experiment at 7.5 eV However, the present results for the stretch modes are less than the experimental values.