Abstract
Abstract An angle-resolved electron energy loss apparatus has been constructed for studying electron scattering by gaseous molecules. Generalized oscillator strength distribution of H 2 O has been determined by the use of the Bethe sum rule and is presented as a form of Bethe surface, covering the momentum transfer range from 0.52 to 3.36 a.u. and the energy loss range up to 400 eV. X-ray incoherent scattering factor or static structure factor S ( K ) has been subsequently derived and compared with those by theoretical calculations as well as by inelastic X-ray scattering studies. S ( K )s by the three different methods show remarkable agreement.
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