K (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,
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
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
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
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
