Can anyone recommend literature references for size/strain analysis on "organic" (C, H, O, N) phases? (this is for Crystallite size/strain - not particle size determination) Plus are there any suggestions on information on sample presentation methods if using Bragg Brentano instruments; standards that are used to determine the instrumental conditions, and software that has been used for organics in the past? Thanks in advance, Lachlan. -- Lachlan M. D. Cranswick Collaborative Computational Project No 14 (CCP14) for Single Crystal and Powder Diffraction Daresbury Laboratory, Warrington, WA4 4AD U.K Tel: +44-1925-603703 Fax: +44-1925-603124 E-mail: [EMAIL PROTECTED] Ext: 3703 Room C14 http://www.ccp14.ac.uk