Why does the FWHM in XPS need to be the same for doublets?

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Jürgen Weippert

The FWHM is, besides apparative influences, determined by the physics going on when the ionization and transfer out of the solid are happening. A doublet is the result of very similar physical processes, therefore the FWHM should reflect that.

Thorsten Schultz

Although what Jürgen Weippert says is usually true, there are some exceptions

e.g. Ti2p ( see https://www.jp.xpssimplified.com/elements/titanium.php)

Thorsten Schultz That's a very good website, I'll bookmark it.