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The x-ray incoherent scattering factor for molecular nitrogen as determined by high energy electron scattering

1986; Wiley; Volume: 30; Issue: S20 Linguagem: Inglês

10.1002/qua.560300755

1097-461X

S. N. Ketkar, R. A. Bonham,

Electron and X-Ray Spectroscopy Techniques

A beam of high energy electrons, 25 keV, was scattered off an effusive gas jet of molecular nitrogen, and the energy loss spectrum from 0 to 800 eV was measured for scattering angles ranging from 0.3° to 2.0°. The energy loss spectra were converted to relative generalized oscillator strength (GOS) distributions and Bethe sum rule normalized to an absolute intensity scale. The x-ray incoherent scattering factor, S(K), as a function of momentum transfer, K, was determined by the use of the S(-1,K) GOS sum rule and compared with the predictions of theory. The effect of electron correlation on S(K) was determined by comparison of the experiment with molecular near Hartree–Fock calculations. Results from an extensive CI calculation were found to be in agreement with our experimental results, but proposed scaling of the CI theory appears to be incorrect.