K&A (and also Brentano, upon rereading) say that in order to be focussing,
the sample also needs to be toroidally curved; curved along ACB as well as
be rotated about the axis AB; so it is a little more than the traditional
flat-sample effect
So summarising everyone here, and the papers I've been
I just read through the rest of the discussion. He only thing to add is that I
think the flat sample does play a role in the para part of the focusing.
A real focusing experiment includes the light source entrance slit, “curved
diffraction grating” (what we call our sample), and exit slits all
Matthew,
I think Klug & Alexander (1974) give a good explanation about the origin of the
term "parafocusing": 2nd edition, section "parafocusing methods", page 222 ff.
Cheers,
Arnt
From: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] On Behalf Of
Eduard E. Levin
Sent: Montag, 2.
Dear James,
For me too, please, if it would not be much of a trouble.
Thank you in advance!
Eduard
On Mon, 2 May 2016 11:09:31 +, Cline, James Dr. (Fed) wrote
> Bob Cheary and I developed and presented a workshop several times in the
> 1990's that included a discussion of this issue. I can
Bob Cheary and I developed and presented a workshop several times in the 1990’s
that included a discussion of this issue. I can send you the notes for it if
you would like them.
Jim
James P. Cline
Materials Measurement Science Division
National Institute of Standards and Technology
100 Bureau
The prefix "para-" has several definitions, one of which is "abnormal,
incorrect" or "resembling". I assumed this prefix was used because BB geometry
uses the focusing condition but is not truly a focusing geometry: The
diffractometer circle and focusing circle being different causes the focusin
OK,
why not to go to Oxford dictionary and consider Greek origin od the word ?
If doing so one finds :
1.1Beyond or distinct from, but analogous to:
and there's, IMHO, the point.
Best,
Lubo
++
Please do NOT attach files to the whole
Hi Matthew,
I've got some nice figures from an old XRD Basics presentation from decades ago
- the problem is that all this stuff is in my CSIRO office and I'm at home!
However, I will do my best to recall the basic principles of parafocusing In a
Bragg-Brentano instrument:-
1. The sourc
