By J. J. (edited by) Fripiat
Invited Contributions from the Symposium held through the seventh overseas Clay convention, Bologna and Pavia, Italy, 6-12 Sept. 1981
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Additional info for Advanced techniques for clay mineral analysis: invited contributions from the symposium held at the 7th International Clay Conference, September 6-12, 1981, Bologna and Pavia, Italy
Firstly, their wavelengths are comparable to interatomic separations, and secondly their energies correspond to those characteristic of vibrational modes of crystals and molecular solids and liquids. This dual comparability may be contrasted with electromagnetic radiation such as Xrays (satisfying only the first condition) and infra-red radiation (satisfying only the second). Another essential difference between neutrons and electromagnetic radiation lies in the fact that, except in the case of magnetic materials, neutrons are scattered by nuclei and not electrons.
3 . O v e r a l l a s p e c t o f t h e phase c o n t r a s t t r a n s f e r f u n c t i o n i n t h e f o c a l p l a n e f o r Scherzer d e f o c u s , p l o t t e d a g a i n s t s p a t i a l p e r i o d i c i t i e s , f o r 100 and 1000 keV. g. g. a t o m i c rows). 4. 3. 10m3rd F o r a L g h uoMage m i a o ~ c o p et h e s t r u c t u r e r e s o l u t i o n i s a g r e a t deal b e t t e r . M. 33 cm, i t g e t s down t o a b o u t 2 A ( s e e F i g . 3 ) . F u r t h e r m o r e s c a t t e r i n g and energy l o s s e s a r e reduced, so t h a t t h e t h i c k n e s s can be i n c r e a s e d w i t h i n t h e weak-object a p p r o x i m a t i o n .
8 (A Cs) 1’4 w i t h a. 0 6X 1/4 do =[c) 5 Defocusing reduces t h e a b e r r a t i o n smearing (see F i g . 2 ) . thus a l l o w i n g a l a r g e r dedocud) aperture. ao T h i s r e s o l u t i o n can be c a l l e d t h e Schehzeh de60cu-6 hedoLuLion. I t can be seen from F i g . 3 t h a t i t corresponds a p p r o x i m a t e l y t o t h e f i r s t z e r o o f t h e phasec o n t r a s t t r a n s f e r - f u n c t i o n and t h a t t h e siny-component i s c l o s e t o u n i t y w i t h i n a good p a r t o f t h e a p e r t u r e , p r o v i d i n g an a l m o s t p h a s e - o b j e c t imaging a c c o r d i n g .
Advanced techniques for clay mineral analysis: invited contributions from the symposium held at the 7th International Clay Conference, September 6-12, 1981, Bologna and Pavia, Italy by J. J. (edited by) Fripiat