Direct methods
	This set of exercises illuminates the basic concepts of structure determination through direct methods. The examples let the students explore the constrains on phases that exist in centrosymmetric versus non centrosymmetric structures, underlying statistics to determine the presence of a center of symmetry etc.
	Examples in this section ..
	Interactive example 1: Electron density from a single reflection .. Interactive example 2: Electron density from two reflections .. Interactive example 3: Phases of h,k,l versus 2h,2k,2l .. Answers and hints concerning the interactive examples ..
	© Th. Proffen and R.B. Neder, 2001
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