[Wien] How to estimate the the core hole lifetime in x-ray absorption spectra calculation

[Lily Anh]

Dear all,
In the input file for x-ray absorption spectra (case.inxs), there is "gamma" which is supposed to related to core-hole lifetime broadening.. So how to estimate the core hole lifetime? Take the oxygen k-edge in ice, how much  "gamma"  is reasonable?
Any advice will be appreciated!
Thanks and regards.
Lily



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