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  • 1970-1974  (3)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    On the determination of the absolute intensity of X-rays scattered by a non-crystalline specimen (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 395-401 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The scattering of amorphous solid or liquid samples with moderate absorption coefficients is advantageously measured in the symmetrical transmission arrangement. For this case, the steps of data processing, converting the raw intensity data into the reduced intensity function, are discussed. The correcting functions are expressed as explicit functions of the angle (&thgr; or 2&thgr;), and of s (= sin &thgr;/λ) as well. The advantages of the latter formulae are demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872010015
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  • 2
    Digitale Medien
    Digitale Medien
    Incoherent X-ray scattering in the free-Fermigas approach (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 161-167 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: A simple equation is derived from one- and two-particle density matrices in the free-Fermi-gas approximation for obtaining the incoherent intensity of X-rays scattered by an atomic N-electron system. The accuracy of the equation is tested on the Thomas-Fermi-Dirac statistical atomic model. The numerical results are compared with those obtained from the known Heisenberg-Bewilogua function and with the atomic incoherent intensities calculated by D. T. Cromer [J. Chem. Phys. (1967). 47, 1892-1893; (1969). 50, 4857-4859] using complete Waller-Hartree theory and the HF SCF model. The results obtained by the present method from the TFD model are in good agreement with Cromer's data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567739474000362
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  • 3
    Digitale Medien
    Digitale Medien
    Analytic approximations for the incoherent X-ray intensities of the atoms from Ca to Am (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 10-12 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Two analogue analytic functions containing three parameters and valid for the atoms Z ≥ 20 have been found, for accurately approximating both the well-known universal Bewilogua function and the atomic incoherent intensities computed by Cromer. The errors of the fits are not greater than the corresponding ones for the coherent intensities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567739473000021
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