So I am working on Cobalt and i have the XPS data as i want to know the oxidation states. but i am not able to differentiate that whether it is Co(III) or Co(II)
Hello, for a starter see here
https://www.jp.xpssimplified.com/elements/cobalt.php
hello, first of all before observing your data you have to check for charging correction by carbon peak data after that fit your peak(you can use any software, like peakfit41). Then you will get some peak and respective peak position(binding energy). So now go through some literature and find out that your peak position should be as Co2 and Co3.
Stefan Baunack thank you for your answer I normally use this website but i havent figuered out the specific oxidation states. from this website
Nitin Kumar Thank you for your Answer, what about when the data has mixed oxidation states than how to distinguish them ?
though my data is fitted
Nitin Kumar Careful with the carbon correction. This method is not very accurate and therefore heavily criticised by people in the community since it may even turn data that may have been correct in the first place into some arbitrary, irreproducible position.
Dear Shoaib Azeem if data has mixed oxidation state then you will get two or more then two peak in a single peak (raw data), while you fit your data. So for example you got two fitted peak then you can compare with standard binding energy to know that which oxidation state you are getting.
Jürgen Weippert yes you are absolutely right but can you please give your suggestion then which method we have to use.
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or in many cases: just none. People are "correcting" spectra that would have been OK in the raw situation and are shifting them towards some value that has no real foundation.
Shoaib Azeem
In order to distinguish between Co2+ and Co3+ I would go back to the early days of ESCA/XPS (which everybody forgets). Take appropriate Co2+ and Co3+ salts and run them in your XPS system. This will give you a good feel of what to expect. You can then vary the system somewhat without changing the character by absorbing (solutions of) the salts on an oxide such as silica and then looking at the new spectra. In this way you may be able to begin to understand your system. Good luck with your research.
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