By R. Brill and R. Mason (Eds.)
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A lot of natural chemistry relies at the skill of definitely established chemical substances to bind jointly in the course of the formation of covalent bonds. Biochemistry is replete with examination ples of enzymatically catalyzed reactions during which common physique components might be associated via covalent bonds throughout the technique of middleman metabolism.
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5) and AT is proportional to MM0, that is to the parameter 77 which we have defined (equation (II-4-3)) to characterize the departure from Bragg' law of a plane wave. Let us introduce a function D® equal to £> 1. Equation (IV-4-1) shows that D'hs and Z>£ are Fourier transforms. This result is very important since it shows as well that the solutions £>£ 46 A. Authier and D^ of the propagation equation for incident plane and spherical waves respec tively are proportional to Fourier transforms.
1 Bethe's Theory The dynamical theory of electron diffraction was developed by Bethe  in 1928. It was the aim of this theory to solve Schrodinger's equation inside a crystal plate, extended infinitely in two dimensions, adapting the solutions at the boundary faces to one incident plane wave and a set of diffracted plane waves leaving the surfaces into the vacuum. We will briefly recapitulate here this theory. Neglecting for the moment the dyna mics of the crystal particles (nuclei and electrons), we regard the potential energy in Schrodinger's equation as a static one, V(r) = - e • 0(r), acting on the scattered electron at the point r.