Summary: How to explain phase determinaton and Fourier
nobuhisa at kekvax.kek.jp
Sat Sep 17 23:31:22 EST 1994
I have received ten responses by e-mail for my post. And the half of them
are asking to post the summaries here.
The answer for the question: "How can you get an electron density maps
from the diffraction spots?" is,
Almost all wrote the only one way to explain the diffraction is using He-Ne
laser with some meshes, slits, or photo reduced two dimensional patterns.
I think there is no good idea to explain phasing to the "public".
"Using some tricks" is enough?
3) Fourier transform.
Using Prof. Henk Schenk's overhead projector method might be most
>he had some sheets for the overhead projector with some parallel lines,
>representing the waves.
>He put them ('quite randomly') on top of each other and the result was a
>rather featureless, blurred picture. Then he started to explain about
>direct methods etc. and after that he put the sheets on top of each other
>again (but this time properly aligned i.e. all corners on top of each other)
>and the electron density map of a benzene ring emerged ...
I know what it is. But I do not know there are any references. Please post
here if someone knows any references. And I wonder if someone copy this to
a nice software using graphics?
#I found I made a mistake when I post the previous question.
#I am very sorry for inconvenience.
Photon Factory, Natinal Laboratory for High Energy Physics
e-mail: nobuhisa at kekvax.kek.jp
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