I have a few questions regarding XPS analysis, particularly for Cl⁻ 2p 3/2 and 2p 1/2 peaks. Here are my main points of inquiry:
Would it be best practice to fix these parameters before running the peak fitting optimization?
Thank you for your time and guidance. I look forward to your response.
Best regards,
There is no general answer to this question. It depends on the system and I have no experience with Cl. I have examples with Si 2p where constraints were appropriate, but with Ti 2p they were not. Unless there are examples/experiences in the literature, you have to go with your data. Start with constraints, but if the data require to relax the constraints, do so and it becomes part of your findings. You may have to make assumption to end up with unique answers. Making a clear distinction between the facts from your spectra and your interpretation, based on such assumptions, may become important.
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