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Two-photon calculation? #458

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jwreep opened this issue Feb 12, 2024 · 1 comment
Open

Two-photon calculation? #458

jwreep opened this issue Feb 12, 2024 · 1 comment

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@jwreep
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jwreep commented Feb 12, 2024

The calculation of the two-photon continuum does not seem to match the equation in the CHIANTI user's guide:
Screenshot 2024-02-12 at 11 26 48 AM

As far as I can tell, the equation as programmed (in ChiantiPy or IDL) is:
Untitled
and $A_{\text{sum}} = 1$ for helium-like ions.

It might be that the mismatch is in the guide's definition of $\phi(y)$? It's not stated what that definition is (nor is it in the Young et al paper). Could this please be clarified? What is the full form of the equation used by Chianti and what is the appropriate reference?

Additionally, what is the $A_{\text{sum}}$ term found in the hydrogen-like data files? What are its units? I have not been able to find any papers that reference it.

Any help would be greatly appreciated!

@jwreep
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jwreep commented Feb 16, 2024

The $A_{\text{sum}}$ term appears to be a normalization factor of the integral of $\phi(y)$ (or $\psi(y)$ in the code). See here.. Confirmation would be appreciated, though!

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