Hello dear scientific community!
Usually XRR patterns which I saw in papers presents range since 2theta>0,1degree and they starts with plateau where we can determine a critical angle.
But often I also saw patterns in range from 0 degree and sometimes it is observed additional peak before main plateau (below 0.1 degree). They could be as a peak or just decreasing right shoulder.
Please could you help to explain this and should we avoid this phenomena?
Please visit links to see some examples.
Thank you!
http://www.hzdr.de/db/Cms?pOid=11657&pNid=0
http://www.rigaku.com/en/products/xrd/smartlab/app032
http://www.dep.fmph.uniba.sk/mambo/index.php?option=com_content&task=view&id=259&Itemid=28
http://www.ceriumlabs.com/55/XRR_measurements.htm
Could it be that you mean the effects which are caused by the limited sample length and thus the direct beam hitting the detector without reflection for very small incident angles as well as the footprint effect, due to a larger beam projection than the sample is in size?
http://www.ncnr.nist.gov/reflpak/reflpak/html/reflred/footprint_correction.html
Hello Bogdan,
I agree with above answer of Philipp, it's most likely a part of direct beam. We usually have it in our set-up below 0.1°
Best Regards,
Gregory
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