Overall values of conventional discrepancy indices for related and unrelated models of a non-centrosymmetric crystal with a centrosymmetric group |
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Authors: | M N Ponnuswamy S Parthasarathy |
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Institution: | (1) Department of Crystallography and Biophysics, University of Madras, 600 025 Guindy Campus, Madras, India |
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Abstract: | Theoretical expressions for the overall values of the conventional discrepancy indicesR(F) andR(I) are derived for a non-centrosymmetric crystal with a centrosymmetric group by taking the centrosymmetric group and a part
of the other atoms in the unit cell as the trial structure. These results are used to obtain tables of values of these indices
in terms of the parameter σ
1c
2
and σ
1
2
which define the fractional contribution to the local mean intensity from the centrosymmetric group and all the known atoms
respectively.
Contribution No. 561 |
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Keywords: | Conventional discrepancy indices noncentrosymmetric crystal centrosymmetric group local mean intensity |
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