Abstract
Electron-scattering cross sections for intramolecular and intermolecular vibrational excitation in amorphous solid H2O are reported for the incident energy range 118 eV. The origin of the feature for the stretching modes is ascribed to resonant scattering similar to the gas phase. Those in the translational and librational modes are shown to arise mainly from the interaction of a long-lived transient anion with the dipoles of the surrounding molecules.