Hi Matthew,
On Sat, Oct 8, 2011 at 4:36 PM, Matthew Marcus
Is the core-hole lifetime broadening of pre-edge XANES peaks the same as at the main edge? I'm looking into issues of de-noising of XANES epsctra, so need to figure out how narrow real features can be. mam
I'm sure others are more knowledgeable about this, but I think the answer is the classic "yes, but...". The "yes" part would be: Yes, the core-hole energy width doesn't depend on the final state. The "but" part would be: But that assumes (I think) that the final state has lost all connection to the core level, except the principle quantum number (that is, it has to be p-like for an s hole). That assumption isn't exactly true for bound atomic/molecular states that give the pre-edge peaks, as there is some spin information preserved. I think regular XANES measurements of the pre-edge peaks do include the full core-hole lifetime. But, has been demonstrated many times, with high-energy resolution of the emission (RIXS), one can beat the core-hole lifetime, as the energy-selected emission can come from only a limited portion of the full core-hole energy width. Hopefully, someone will correct any errors in this... --Matt