Re: [sdpd] Hump ???

[Armel Le Bail <alb...@cristal.org>]

Hi,

I made a measurement this night without sample holder.
The hump is still there :
http://www.cristal.org/empty.jpg
I made the pattern in the range 5-40°, it seems that
without the holder there is also another hump close
to 40° which was not detected with a sample...
The 2nd harmonic ?

Some D8 magnetic big sample holder intercept the beam
if the window is not well aligned, or if you make rotate the
sample, but in that case, the hump is produced at an angle
close to 12° (2-theta). So this is not the cause in this case.

Armel


At 04:04 28/02/2005 -0800, you wrote:

> > Since more than one year, our powder patterns made
> > on a Bruker D8 Advance show a strange and systematic
> > hump in the range 18-24° 2-theta.
>
>Dear Armel,
>
>Did you try measurements without sample? If you don?t see the hump
>without sample then it might come from the sample holder borders. If
>you see it without sample then it may mean that the primary beam
>penetrates somewhere through the slit holder.
>
>Best regards,
>Leonid
>
>
>
>
>
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