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The x‐ray incoherent scattering factor for molecular nitrogen as determined by high energy electron scattering
Author(s) -
Ketkar S. N.,
Bonham R. A.
Publication year - 1986
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560300755
Subject(s) - atomic physics , scattering , momentum transfer , electron scattering , electron , scaling , chemistry , sum rule in quantum mechanics , spectral line , absolute scale , momentum (technical analysis) , incoherent scatter , intensity (physics) , physics , nuclear physics , optics , quantum mechanics , geometry , mathematics , finance , economics , quantum chromodynamics
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.