Dear all,
I am about to analyze my XPS data with a variation of polar angle (people call this technique as XPD or x-ray photoelectron diffraction). So now I have a graph of intensity against polar angle. The thing is the intensities go down so steep (start from 3000 a.u. to almost 0 a.u). Then I think to perform linear background subtraction. My doubt comes when the value of background intensities change with polar angles. I am thinking that I can average the value of background intensities as they vary from 1600 a.u. to 2200 a.u. Is my thought acceptable?
Thank you very much in advance.
Best Regards,
Efi
You may find this article useful, although it would be convenient if you did not perform the subtraction of the background. I'm confused with the term "electron diffraction" maybe you mean ARXPS. Make sure your measurements were made on the correct axis of rotation. For that I leave you two important articles.
Best regards.
https://www.researchgate.net/publication/261190061_Practical_methods_for_background_subtraction_in_photoemission_spectra
https://www.researchgate.net/publication/234082230_Instrument-related_geometrical_factors_affecting_the_intensity_in_XPS_and_ARXPS_experiments?_iepl%5BviewId%5D=yOiMzXK4RvHq8rIx49rTFjtV&_iepl%5BprofilePublicationItemVariant%5D=default&_iepl%5Bcontexts%5D%5B0%5D=prfpi&_iepl%5BtargetEntityId%5D=PB%3A234082230&_iepl%5BinteractionType%5D=publicationTitle
Article Practical methods for background subtraction in photoemission spectra
Article Instrument-related geometrical factors affecting the intensi...
The drop of intensity is expected, the signal drops of dramatically as the angle changes just as it does for ARXPS. Though I have not done XPD analysis myself I believe that the background should be based on the angle rather than a static background independent of the total signal.
This paper discusses how they treated the background a little, basically they normalize signal intensity on a 0-1 scale for each angle.
http://www.sciencedirect.com/science/article/pii/S0368204800002395
Just a note ... Never attach a journal article unless you have copyright permission.
I would propose the original works of Chuck Fadley, e.g. in Physica Scripta (1987) p. 39, Doi: 10.1088/0031-8949/1987/T17/005
Good luck, Dirk
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