Dear Chen,
Twinning can be thought of as of two or more macro-crystals glued or grown
together. The reason that the reflections often overlap is that they share one
common plane from which they grow in different directions. Many twinning tests
are based on the fact that the two (or more) macro
CP4BB@JISCMAIL.AC.UK] on behalf of James Holton
[jmhol...@lbl.gov]
Sent: Thursday, April 24, 2014 6:59 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] AW: [ccp4bb] Twinning VS. Disorder
There are two kinds of "coherence length": transverse and longitudinal.
Longitudinal coherence is
There are two kinds of "coherence length": transverse and longitudinal.
Longitudinal coherence is often quoted as delta-lambda/lambda, which is
easy to calculate but unfortunately completely irrelevant for diffraction
from crystals. If it weren't then Laue diffraction wouldn't produce spots.
Tran
Dear Herman
On 24 April 2014 22:32, wrote:
>
>
> The X-ray coherent length is depending on the crystal, not the synchrotron
> and my gut feeling is that it is at least several hundred unit cells, but
> here other experts may correct me.
>
>
>
I assume you meant that the coherence length is a pr
, April 24, 2014 7:01 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] AW: [ccp4bb] Twinning VS. Disorder
Dear Herman
On 24 April 2014 22:32,
mailto:herman.schreu...@sanofi.com>> wrote:
The X-ray coherent length is depending on the crystal, not the synchrotron and
my gut feeling is that it
the degree of variation in
> that direction.
>
> JPK
>
>
> From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf
> Of Ian Tickle Sent: Thursday, April 24, 2014 7:01 PM To:
> CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] AW: [ccp4bb] Twinning
> VS. Disorder
&
ulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
> Ian Tickle Sent: Thursday, April 24, 2014 7:01 PM To:
> CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] AW: [ccp4bb] Twinning VS.
> Disorder
>
>
> Dear Herman On 24 April 2014 22:32,
> mailto:herman.schreu...@sanofi.com
direction (arcs), and unit cell parameter variation should produce
> > straight broadening in the direction of the unit cell variation of
> > magnitude proportional to the degree of variation in that direction.
> >
> > JPK
> >
> >
> > From: CCP4 bulletin bo
, 800±829. The reflexion of X-rays from
imperfect crystals
JPK
From: oliver.zel...@gmail.com [mailto:oliver.zel...@gmail.com] On Behalf Of
Oliver Zeldin
Sent: Friday, April 25, 2014 1:03 PM
To: Keller, Jacob
Cc: CCP4BB@jiscmail.ac.uk
Subject: Re: [ccp4bb] AW: [ccp4bb] Twinning VS. Disorder
Dear
Thanks to all—I’ve got the paper now
JPK
From: Keller, Jacob
Sent: Friday, April 25, 2014 1:58 PM
To: 'Oliver Zeldin'
Cc: CCP4BB@jiscmail.ac.uk
Subject: RE: [ccp4bb] AW: [ccp4bb] Twinning VS. Disorder
Does anyone know of a place where one can obtain this reference for free? I
wou
mains...
Sincerely,
Chen
> On Apr 25, 2014, at 3:21 PM, "Keller, Jacob" wrote:
>
> Thanks to all—I’ve got the paper now
>
> JPK
>
> From: Keller, Jacob
> Sent: Friday, April 25, 2014 1:58 PM
> To: 'Oliver Zeldin'
> Cc: CCP4BB@jiscmail.ac.uk
>
reff: Re: [ccp4bb] AW: [ccp4bb] Twinning VS. Disorder
Dear Herman
On 24 April 2014 22:32,
mailto:herman.schreu...@sanofi.com>> wrote:
The X-ray coherent length is depending on the crystal, not the synchrotron and
my gut feeling is that it is at least several hundred unit cells, but h
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