Hi all,
Recently I am doing SAXS for my thin film sample. I noticed that there are two modes in the equipment, one is reflection and another is transmission. I scanned my samples using those two. And the results are very different. Especially for reflection mode, the substrate background intensity is larger than my sample.
I'm quite new in this area. Only few literature is talking about reflection mode. And it seems that the reflection mode is GISAXS?
Can anyone help me with this? Thank you very much!!
Dear Joyce Zhang ,
please have a look at the link:
https://implant.fs.cvut.cz/saxs-notes/
and the drawing therein, describing the configuration of the transmission mode.
As you already pointed out: the reflection mode is the grazing incidence(GI) case of SAXS. According to the link below, the incidence angle should be close to*) the critical angle of total reflection. When having too much signal from the sample substrate you should go for more grazing incidence.
Examples for penetration depths of x-rays as a function of the angle as well as how to estimate these depths are summarized in:
Presentation Attenuation Length and Penetration Depth of X-rays
*) a bit above
Best regards
G.M.
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