wtbarnes
Add calculation of dielectronic level populations
I don't see another issue for this, so making a new one. See the discussion here.
Fiasco does not currently have a method to calculate level populations for a dielectronic ion.
I think it's worth clarifying what is meant in this issue since I didn't describe it in particular detail. There are no "dielectronic ions" in reality, but CHIANTI creates a separate model ion for dielectronic excitation to calculate satellite lines. The database includes directories like "fe_17" and "fe_17d" to distinguish the two.
This is described in Section 2.2 of the fourth CHIANTI paper:
I agree that this needs to be worked on, but I'm not quite sure how to go about it. Maybe this is because I don't fully understand how it is done in the IDL code.
In v9 and above, dielectronic recombination is included in the level populations calculation through a two-ion model approach. See #254 for more details. However, prior to v9, these so-called satellite lines were treated separately by including a separate ion with a "_d" suffix in the database. This is still true for some ions even in version 9 and above.
What I'm not sure about is how these "_d" data are actually used. In fiasco, if there is a "dielectronic version" of the data, it can be accessed as _dielectronic_<dataset_name>, e.g. fe_15._dielectronic_elvlc would give you the data from the file fe/fe_15d/fe_15d.elvlc. Is it just a matter of making additional Ion objects for these "dielectronic versions" of each ion if they exist?
