MEASUREMENT OF THE ATOMIC SCATTERING FACTOR OF Ne, Ar, Kr, AND Xe
To test the accuracy of the Hartree-Fock (HF) method and the reliability of x-ray measurements of the atomic scattering factor f, the scattering of Mo K alpha radiation by Ne, Ar, Kr, and Xe gases was determined. Values of f were obtained on an absolute basis with an accuracy of about 1/4%. Results at small angle yield the mean-square radius of the electron cloud (r/sup 2/)av and the dispersion correction. For Ne, Ar, and Kr, the values of (r/sup 2/) av are in good agreement with RF calculations. For Xe, the experimental value is significantly lower. Susceptibility results yield about 6% lower values in each case. The derived values of the dispersion correction are each more negative than those obtained from published absorption coefficients. At higher angles, the f values differ by less than 0.2 electron unit from the HF values for all the gases; even for Xe the approximate HF values presently available are more nearly accurate than the Thomas-Fermi-Dirac (TFD) values. It is concluded that a 4% discrepancy between theory and experiment found by Batterman, Chipman, and DeMarco for metal powders arose from solid-state effects or from difficulties in sample preparation. (auth)
- Research Organization:
- U.S. Army Materials Research Agency, Watertown, Mass.
- NSA Number:
- NSA-17-039772
- OSTI ID:
- 4623457
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 132; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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