I have posted ascii files (labeled ".dat") and pics (sorry they are
bmp instead of jpg)of some representative data I obtain from my image
plate. They were integrated on Fit2D using no polarisation or
geometrical correction. "Conserve Integration" was used.
Description of files:
"No_x-rays" means its a scan of image plate when not irradiated with
x-rays...just a clean scan of plate
"Tape_only" means scan of image plate after irradiation of transparent
tape used to suspend samples....no sample, just tape
"Tape+NaCl" means scan of image plate after NaCl (our
calibrant)suspended on transparent tape is irradiated.
Any suggestions or comments are welcomed.
Thanks, Yetta
P.S. Let me know if you can't access the files (its in Bckgrnd
Subtr.zip), I'll send then to you directly.
--- In [EMAIL PROTECTED] <mailto:sdpd%40yahoogroups.com>, Jon Wright
<[EMAIL PROTECTED]> wrote:
Hello Yetta,
If you can also add a jpg of the image too, it would show whether there
is a high background in the actual data too. Otherwise try fit2d's
"Image Processing, Display, Slice" feature to get a 1d projection for
comparision. There are some options in fit2d which can cause
confusion(eg, remember to subtract the detector dark current, also
check
your values on "conserve int.", "polarisation", "geometry cor."). These
are explained in the online help.
Otherwise, Compton scattering is a form of background which
increases at
high angles, see eg, J.Appl.Cryst (1995) 28 14-19.
Take a look at the fit2d macros menu for "high through put".
Best,
Jon
[EMAIL PROTECTED] wrote:
>
>
> Hello Yetta,
>
> Would you like to deposit your raw ascii data elsewhere and then
share
> us a link? i believe it helps for discussion, and solutions,
hopefully.
>
>
> Faithfully
> Jun Lu
> ----------
> Lst. Prof. Lijie Qiao
> Department of Materials Physics and Chemistry
> University of Science and Technology Beijing
> 100083 Beijing
> P.R. China
> http://www.instrument.com.cn/ilog/handsomeland/
<http://www.instrument.com.cn/ilog/handsomeland/>
> <http://www.instrument.com.cn/ilog/handsomeland/
<http://www.instrument.com.cn/ilog/handsomeland/>>
>
> Lst. Prof. Loidl and Lunkenheimer
> Experimental Physics V
> Center for Electronic Correlations and Magnetism (EKM)
> University of Augsburg
> Universitaetsstr. 2
> 86159 Augsburg
> Germany
> http://www.physik.uni-augsburg.de/exp5
<http://www.physik.uni-augsburg.de/exp5>
> <http://www.physik.uni-augsburg.de/exp5
<http://www.physik.uni-augsburg.de/exp5>>
>
> ----- Original Message -----
> From: ypchapman
> To: [EMAIL PROTECTED] <mailto:sdpd%40yahoogroups.com>
<mailto:sdpd%40yahoogroups.com>
> Sent: Wednesday, August 06, 2008 11:17 PM
> Subject: [sdpd] Background Subtractions / 2D image plate
>
>
> Hello all,
>
> Does anyone know why my Mar 345 image plate leaves a large background
> at high 2theta angles in my powder x-ray diffraction pattern. My
> procedure consists of :
> 1. collecting diffraction rings through transmission from powder using
> the image plate
> 2. integration of rings using Fit2D program.
>
> Concern: the intensities are unreliable because of background that
> appears to be from the image plate.
>
> Goal: To subtract this background from each pattern in a high
> throughput manner.
>
> All suggestions and comments are welcomed.
>
> Yetta
>
>
>
>
>
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