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spex-xray / spex-help

These are the help and manual pages for the SPEX X-ray spectral fitting package.
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Obtaining list of transition notations #17

Open EfremBraun opened 3 years ago

EfremBraun commented 3 years ago

In conjunction with the spectral line list that is given at https://var.sron.nl/SPEX-doc/physics/linelist.pdf, it would be nice to have a list that defines the transitions that are given there (e.g., what A8B means). I see in Table 3 of https://var.sron.nl/SPEX-doc/physics/trpb01.pdf that these notations are given in Table 3 of Mewe et al 1985. I'm wondering if some updates were made to that list; I see A8 present, but I don't see A8B.

Please let me know if there's an updated list of transition notations, and if so, where I could obtain it (preferably in a way that I could copy/paste it to a CSV file on my computer for a lookup table).

liyigu commented 3 years ago

Dear Efrem

Thank you for reporting the issue. The spectral line list you referred to is an outcome of SPEX version 2 run. My understanding is that this list experienced only minor update (e.g., maybe a few fix to wavelength bugs), the majority of the list including the notations has not been changed since SPEX version 3 came out. Meanwhile, for species of low ionization states such as Fe IX you mentioned, SPEX version 2 is indeed the only available data for the moment. Reason for that is calculating new atomic data for all processes to Ar sequence is a long way to go, though I am sure we will be there at some point in the future.

As for the A8B example, I checked the notation of Ar sequence in the line list. What I found is that it does not always follow the rule in the paper Mewe et al. 1985. Below (also in the file attached) I give the transitions that I came up with based on my own calculation.

notation lower term - upper term A1A 3p6 1S0 - 3p5 4d 3D1 A1B 3p6 1S0 - 3p5 4d 1P1 A2 3p6 1S0 - 3p5 4s 1P1 A3 3p6 1S0 - 3p5 4s 3P1 A4 3p6 1S0 - 3p5 3d 1P1 A5A 3p5 3d 3P1 - 3p5 3d 1F3 A5B 3p5 3d 3P2 - 3p5 3d 1F3 A6A 3p5 3d 3P1 - 3p5 3d 3D2 A6B 3p6 1S0 - 3p5 3d 3D2 A7 3p6 1S0 - 3p5 3d 3D1 A8A 3p6 1S0 - 3p5 3d 1D2 A8B 3p5 3d 3P0 - 3p5 3d 1D2 A9 3p6 1S0 - 3p5 3d 3F2 A10 3p6 1S0 - 3p5 3d 3P2 A11 3p6 1S0 - 3p5 3d 3P1

arsequence.txt

I do not know why the notation sometimes differs from Mewe et al, and how about the other sequences. But I am sure that we should come up with a new guide to the notations and replace the old reference with the new table.

If you still have other questions about the line list please let me know.

thanks liyi

EfremBraun commented 3 years ago

Very helpful, thank you!

But I am sure that we should come up with a new guide to the notations and replace the old reference with the new table.

Good to hear. I suppose I'll just leave this issue open in the meantime.