I am surprised to not easily find this information in the literature I consulted so far. My guess it that that the lifetime width will range somewhere around 250..500 meV and I'd like to know a well-analyzed result from data taken with good or very good spectral resolution. Any hint is appreciated. Thanks.
Thank you, Behnam, for those hints.
Unfortunately, though, Grosvenor et al. do not report on metallic Fe (unfortunate, because their resolution is fairly good). And, indeed, FWHMs are reported, but not the Lorentzian contributions to them, which would be the core hole lifetime part.
The report by Herrera-Gomez et al. tells me that the issue of core level line shape may not even be settled. And Lorentzian contribs to the diverse peaks are also not separately mentioned. They offer peak fitting but little physics (no offense implied). Maybe I should drop Alberto a mail in this respect to seek his opinion.
Hi,
In https://www.diva-portal.org/smash/get/diva2:170043/FULLTEXT01.pdf page 29 you might get some references to your question:
"3.7 Line shape of spectral features
There are different contributions to the shape of a spectral line, such as lifetime, vibrations, inelastic losses and experimental broadening [36, 25]. The lifetime, of a core hole state, such that created during a PE or XA process, is typically in the femtosecond regime. Due to the decaying nature of the excited state the finite lifetime4 of the core hole introduces a broadening of the spectral line described by a Lorentzian line shape [25]. As an example, the broader line shape of the Fe2p1/2 with respect to the F e2p3/2 component in PES and XAS can be related to the shorter lifetime of the Fe2p1/2 core hole state [37]. The core hole lifetime can be used to probe charge transfer processes in a femtosecond time scale [38].
The spectra can be further broadened by the presence of vibrational features [33], which often are the dominant contribution to the line shape. As an example the asymmetric line shape of C1s in benzene is largely due to vibrational features [39]. Often for adsorbates on surfaces the frus- trated rotation and vibration modes give rise to new vibrational modes, which introduce a small broadening of the line with respect to a core line of gas phase molecules."
I would recommend to start searching for J. L. Campell and T. Papp, At. Data Nucl. Data Tables 77, 1 (2001), which is a good reference for core hole life times in general. This is also often sighted in other work that could lead you forward.
Best regards,
John
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