Download Advances in X-Ray Analysis: Volume 27 by Jerome B. Cohen PDF

By Jerome B. Cohen

This quantity constitutes the lawsuits of the 1983 Denver convention on functions of X-ray research and is the twenty seventh within the sequence. The convention was once held together with the yank Crystal­ lographic organization at Snowmass inn, Colorado, from August 1 to five, 1983. The papers showing during this quantity are just from pre­ dominantly Denver convention (DC) periods and from joint DC/ACA classes. The early plans for containing a joint convention have been initiated a few 3 years in the past by means of Q. C. Johnson of Lawrence Livermore Lab, J. B. Cohen of Northwestern college and P. ok. Predecki of the college of Denver and have been ultimately dropped at fruition by way of a jOint organizing committee which includes: O. P. Anderson, Colorado kingdom college (ACA) , D. E. Leyden, Colorado kingdom college (DC), R. D. Witters, Colorado institution of Mines (ACA) and P. ok. Predecki (DC). We take this chance to thank the committee contributors and the early planners for his or her imaginative and prescient, ingenuity and tough paintings with out which the convention do not need materialized. there has been no plenary consultation in 1983, in its place a couple of detailed periods have been equipped and chaired through a number of contributors.

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Extra resources for Advances in X-Ray Analysis: Volume 27

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Cryst. 2 (1969) 72-76 (10) M. Hecq, "A Fitting Method for X-ray Diffraction Profiles", J. Appl. Cryst. 14 (1981) 60-61 (11) G. K. Wertheim, M. A. Butler, K. W. West and D. N. E. Buchanan, "Determination of the Gaussian and Lorentzian Content of Experimental Line Shapes", Rev. Sci. Instrum. 45 (1974) 1369-1371 (12) C. N. J. Wagner, "Analysis of the Broadening and Changes in Position of the Peaks in an X-ray Powder Pattern", iii. Local Atomic Arrangement Studied by X-ray Diffraction, edited by J.

41 S. ENZO AND W . PARRISH function but a maximum occurs before the asymptotic value is reached. The least squares fitting procedure applied to curve 2 of Figure 2(d) in the same r~ge as for (b) gave B=1008, which is less than 1% from the true value. APPLICATION TO EXPERIMENTAL DATA The background subtraction method has been used successfully in a number of analyses and a few typical cases will be described. Figure 3(a) shows the experimental (200) line profile of a pure palladium powder sample.

Aaa ........................ 0 39 40 . ....... _---_. 00 41 Figure 1. The intensity distribution of a pseudo-Voigt function from Equation 1 (full line) with a background B added (dashed line) and the second moment intensity distribution (crosses). Symbols explained in the text. Note that points on the profile have different positions on the variance plot. The negative values on the S2 scale refer the low 28-side of the peak. 40 I. SEARCH/MATCH METHODS • Tests of the Method The method was first tried using a series of profiles synthesized on the computer because all the parameters are exactly known.

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