Hi Jakub,

No worries.

Actually I blame myself. I published on these electron (or Z) fraction based Z-bar calculations for both elastic scattering and continuum production 20 years ago. At the time I thought the effects would not be so significant for normal EPMA work.

But then people more recently starting utilizing high Z materials in their MAN background fits, which allows for a greater possibility of compounds with very different A/Z ratios. And again, Ben Buse starting the elastic scattering discussion again with his re-discovery of the Z-bar effect when running BSE simulations in Penepma and WinCasino.

Now I realize that these effects are significant enough, especially in the case of high Z elements. So indeed we should be implementing these new Z-bar calculations into our quantitative software. This has been done in Probe for EPMA for the MAN curves, as shown in several posts above.

On the Z fraction elastic scattering Z-bar calculations, I am working with one of our colleagues on modifying perhaps the Pouchou & Pichior backscatter loss equations, and hopefully we'll have something to show later this year. It turns out that everyone in the past just assumed that BSE loss simply scales with mass! How silly of us...

But in the meantime you can read the abstract on elastic scattering that I will be presenting at M&M next month in Portland which is attached to this post:

https://probesoftware.com/smf/index.php?topic=1111.msg8249#msg8249The thing that amazes me is that both continuum production *and* BSE loss are well modeled by applying the Z^0.7 Z fraction average atomic number equations. Two completely different physical processes...