S Parthasarathy
Articles written in Pramana – Journal of Physics
Volume 9 Issue 1 July 1977 pp 61-69 Crystallography
V Parthasarathi S Parthasarathy
The probability distributions of the fractional intensities and amplitudes of x-ray reflections from a pair of imperfectly related structures are derived when both the structures satisfy the requirements of a given type of basic Wilson distribution. These two distributions are used to obtain theoretical expressions for 2 new fractional type of
Volume 16 Issue 3 March 1981 pp 257-271 Chemical Physics
S Parthasarathy M N Ponnuswamy
The joint probability density functions of the normalized structure amplitudes of the structure and the model (
Volume 16 Issue 4 April 1981 pp 295-308 Chemical Physics
S Parthasarathy M N Ponnuswamy
Theoretical expressions of 〈
Volume 17 Issue 1 July 1981 pp 69-80 Crystallography
M N Ponnuswamy S Parthasarathy
Theoretical expressions for the overall values of the conventional discrepancy indices
Volume 17 Issue 6 December 1981 pp 499-508 Crystallography
Theoretical expressions for the local values of six types of unnormalized
Volume 29 Issue 2 August 1987 pp 193-206 Condensed Matter Physics
Theoretical evaluation of the probability of success of the quasi-anomalous method
K Chinnakali S Parthasarathy N Elango
Theoretical expressions for the probability of success of the quasi-anomalous method have been derived for triclinic, monoclinic and orthorhombic crystals containing a few (1, 2 or 3) heavy atoms per asymmetric unit besides a large number of light atoms. The results derived take into account data-truncation due to unobserved reflections. Using the theoretical expressions, tables of probability values for the success of the quasi-anomalous method are obtained as a function of the relevant parameters
Volume 36 Issue 6 June 1991 pp 581-588
Theoretical evaluation of the overall values of Booth type R-indices based on intensity variables
S Parthasarathy N Elango K Sekar
Theoretical expressions for the overall values of three Booth type R-indices based on intensity variables are derived. The results are applicable to crystals of any space group containing any number and type of atoms at general positions in the asymmetric unit. The theoretical results were tested in the case of models of a few crystal structures.
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