Re: [ccp4bb] Questions about diffraction

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

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Subject: PX Jobs Team Leader, Postdoc, Tech (SGC-Oxford).txt
From: Frank von Delft frank {- dot -} vondelft {- at -} SGC {- dot -} OX {- dot -} AC {- dot -} UK
Date: 2007-08-24

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Subject: Re: Questions about diffraction
From: Dale Tronrud det102 {- at -} UOXRAY {- dot -} UOREGON {- dot -} EDU
Date: 2007-08-24

Subject: Re: Questions about diffraction
From: Ethan Merritt merritt {- at -} U {- dot -} WASHINGTON {- dot -} EDU
Date: 2007-08-24

On Friday 24 August 2007 12:22, Michel Fodje wrote:

> 1. In every description of Braggs' law I've seen, the in-coming waves
> have to be in phase. Why is that? Given that the sources used for
> diffraction studies are mostly non-coherent.

Think of Bragg's Law as explaining what happens to a single photon
that is probabilistically scattered by every atom in the lattice.
It's perfectly coherent with itself.

This idea should be no stranger than textbook illustrations of the
result of sending a single particle through a narrow slit or pinhole.
The interference effects follow the expected predictions even for
illumination by one particle at a time.

--
Ethan A Merritt

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

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Subject: Re: Questions about diffraction
From: Dale Tronrud det102 {- at -} UOXRAY {- dot -} UOREGON {- dot -} EDU
Date: 2007-08-24