Release note for xrism prerelease 12:

Largely bugfixes.

(1) Update to Li-like data. The A-values and wavelengths for doubly excited states with n>2 (e.g. 1s 2l 3l, 4l, 5l etc) were from Liang et al. This dataset was designed for collisional excitation and therefore was innacurate for some of these A-values. These have been amended, along with update to the wavelengths, largely based on Autostructure calculations.


(2) Dielectronic satellite data for the Be-like satellites was twice as strong as it should have been due to a typo. This has been remedied.

(3) Mg_11 (He-like) data were completely missing from prerelease 11 due to a packaging error

Still to be integrated before final release:
(1) Update of ionization rates, including double ionization. This data is ready just not integrated yet.
(2) Correction to high-n top up for H- and He-like ions: This is currently based on autostructure calculations which are fine *but* have issues at high temperature extrappolation, which is a problem for ionizing plasma where this is needed (above ~ T=5x10^7K, though this depends on the ion) may actually be significant

Examples of the changes in the Fe complex are shown in the attached pdf (Figure_1.pdf). This shows Photon Emissivity Coeffients (PECs) for iron ions at T=1.5keV. No ionization balance is assumed, though elemental abundance is factored in.

Adam Foster 2024-11-07
afoster@cfa.harvard.edu

