Sorry. a few extra words needed about this thing and i thought we were talking
about the same thing. but totally forgot the design
The original D4's blocker/knife looked like a cantilever hanging from the
primary slits assemblage. I used it for a few months and found it cumbersome
(it sat in the drawer for ever and ever). so had a piece machined and installed
on the stage (there are 4 screws holes on the stage anyway)
currently the D8's blocker is hanging from the theta circle
https://drive.google.com/file/d/0B4aIhU2qbhPjc0tZOVpTc0h6Y2tJdk9KdTJvWWNubVpFTTE4/view?usp=sharing
That figure just shows where the difference is the most obvious. at low 2theta,
the profile difference is hard to judge
i did not mean an antiscatter slit; that thing normally is installed on an arm
infront of the detector
On Thursday, July 30, 2015 12:51 AM, Martin Fisch <m_fi...@bluewin.ch>
wrote:
Hello
I don’t know the new (motorized?) beamknife of the D8. The one of the D4 was
fixed on the moving tube arm and had to be inclined to the sample and to the
left of the goniometer axis.
If you mean something different it is best to ask bruker or the BGMN community
directly. When looking at the figure, I notice that it is 2Theta = 150°. With a
(normal and correctly adjusted) beamknife, you cannot measure above ca. 110°.
MAybe you mean an antiscatter slit in the beam? As this says, it only reduces
scattering and only changes the BG, no changes to the pattern.
CheersMArtin
On 30.07.2015, at 01:58, ji zhang <jilin_zhang_hous...@yahoo.ca> wrote:
Martin:other than making sure the blade is perpendicular to the sample surface
and parallel to the goniometer axis, I do not understand how to correctly
adjust it.theoretically, it serves like another variable slit thus it should
change the shape and intensity. At least by theory.the attached graph is
calculated peak profiles using configuration modified from Nicola Doebelin's
d8-lynxeye-fds-02_1.sav. the only added statement is AirScat=1 (mm).
certainly it maybe true that at low angles the difference may not be
discernible.
https://drive.google.com/file/d/0B4aIhU2qbhPjT1hLZklTcW0tWFk/view?usp=sharing
On Wednesday, July 29, 2015 4:07 PM, Martin Fisch <m_fi...@bluewin.ch>
wrote:
If correctly adjusted, there is no contribution to the diffraction pattern,
except for changes in the background.
Check whether correctly adjusted with intensities of a known sample from 0 to
ca. 90° 2Theta.
CheersMartin
On 29.07.2015, at 20:59, ji zhang <jilin_zhang_hous...@yahoo.ca> wrote:
|
About ten years ago, I was working on a D4 with lynx eye, had to put an air
scatter blocker 1 or 2 mm above the powder sample. In the beginning, I had to
put simple geometry into the bgmn configuration sav-file until Dr Bergmann put
a parameter airscatter=#.
Now I came back to the business with a D8 with lynx eye; is there anybody here
willing to share the experience of handling it in TOPAZ?
thanks
Jilin zhang
Sent from Yahoo Mail for iPhone |
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