title: Elastic electron scattering from water vapor and ice at high momentum transfer.
abstract: We compare the area, peak separation, and width of the H and O elastic peak for light and heavy water, as observed in spectra of keV electrons scattered over large angles. Peak separation is well reproduced by the theory, but the O:H area ratio is somewhat larger than expected and is equal to the O:D area ratio. Thus no anomalous scattering from H was observed. Only minor differences are observed for scattering from a gaseous or a solid target. The extracted mean kinetic energy of H and D agreed within 5% with the calculated ones for ice. For the more difficult vapor measurements agreement was on a 12% level. A preliminary attempt to extract the O kinetic energy in ice agreed within 10% with the calculated values.
authors: Atomic and Molecular Physics Laboratories, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
authors: M
authors: M
authors: Vos
authors: E
authors: E
authors: Weigold
authors: R
authors: R
authors: Moreh
mesh_terms: D004548:Elasticity; D004583:Electrons; D007053:Ice; D007700:Kinetics; D013227:Steam
chemical_list: D007053:Ice; D013227:Steam