Many, many, many years ago in a galaxy far away I wrote a paper that probably
no-one read that had some systematic data on this for a double mirror parallel
beam system (second mirror as an ‘analyzer’) in flat-plate theta-theta
geometry. This setup is much more sensitive to displacement than mos
This is a very sad day for the powder diffraction community. Any words I write
here cannot add in any meaningful way to the email that was received by members
of the mailing list earlier today.
What I can say is that discussions will start behind the scenes (and sometimes
in front of them) to co
How about 'brute force with some educated guesswork'!
Brute force is a nicer way of putting it than blind luck :-)
See how that goes with reviewers!
Pam
-Original Message-
From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On Behalf Of
A. van der Lee
Sent: Thursday, 17 D
After reading the slew of emails that landed in my inbox over the last couple
of days I'll put my hat on as CPD chair and put my head above the parapet
(hopefully not to be shot at)
The IUCr (and others) have tried to get journals to use powder cifs and
checkcif for structures for some time
You would be well advised to do some background reading on microabsorption as
it will be pretty bad with those two phases and limit the accuracy you may
realistically expect in your quantification
Pam
From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On Behalf Of
Nelson
Sent:
calculate a value via ray-tracing?
It strikes me as a little surprising that we are all buying these, but the
associated corrections are not well documented...
jools
____
From: Whitfield, Pamela S. [whitfiel...@ornl.gov]
Sent: 07 April 2014 21:31
To: Art
nt: Monday, 07 April, 2014 3:14 PM
To: Whitfield, Pamela S.
Cc: Julian R Tolchard; rietveld_l@ill.fr
Subject: Re[4]: Polarization factor por Ge (111) monochromator
Hi everybody,
Nobody is trying to be prickly (at all)!
The topic has been started with particular case for Panalytical machines, an
Now, now no need to be prickly
To be fair to Julian he didn't ask what the polarization was - he asked how it
was calculated. Given that Goebel mirrors are graded multilayers (i.e. not a
fixed diffracting angle) it's a fair question and one I asked myself in 2001.
As the 'minute quote' demonstr
Nelson (and others)
The Scherrer equation is a quick and easy method to get a feel for relative
sizes for data from the same instrument and is still a useful tool in that
regard. However, beware of relying on absolute values from the Scherrer
equation in work to be submitted for peer review. De
Hiya folks
Just a quick notice.
All the retrievable presentation videos (flash video format) from the Erice
powder diffraction school have been collected together and are now available to
view on the CPD website at
http://www.iucr.org/resources/commissions/powder-diffraction/schools/erice2011
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