I have a X-ray powder difraction data that had been collected on conventional difractometr with Cu tube. Starting with some angle the bacground intensity disapear shaply. Can anyone explain why it can appear?
Dear Aleksander,
it is not only the background that disappears but also your net peak signals.
The height adjustment of your sample might not be ok. Please perform some scans at different sample heights. Your sample surface may not be exactly positioned at the axis of your system; I assume it's far too high.
It also might be that in the course of your 2theta scan an obstacle appears in your x-ray beam (either primary beam or scattered beam). Please check your set up for any shaddowing part. Perhaps any filter or support which is not fastened etc.
Probably you have setup problems, such as height adjustment, or beams slits misaligned.
This can be due to the characteristics of the sample? This is not observed on any sample.
Dear Aleksander,
the gradual fading out of XRD signal as a function of 2theta looks quite as a geometric issue as mentioned above. But for sake you may share what type of sample you are analyzing.
Thank you for quick answers mister Martens. I have also other problem with background on my XRD data. I perform measurements with step mode. And sometimes in the arbitrary range of angles random steps have no intensity. This range is placed or near the starting angle or in the end of the diraction pattern. The samples with this problems is the small quantity of powder that is obtained by electrochemical way.
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