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Understanding and modelling astrophysical plasmas on atomic levels whiletaking into account various assumptions (for example, collisional ionisationequilibrium or photoionisation equilibrium) became essential with the progressof high-resolution X-ray spectroscopy. In order to prepare for the upcomingX-ray spectroscopy missions such as XRISM or Athena, the plasma codes withtheir models and the atomic databases need to be up to date and accurate. Onesuch update for the plasma code SPEX is presented in this paper where we focuson the radiative loss due to collisional excitation in the low-density,optically thin regime. We also update the atomic data for neutral hydrogen andinclude the contribution of the dielectronic recombination. With all theseupdates being implemented in SPEX we finally present the new cooling curve. Weinclude the comparison to other plasma codes (MEKAL, APEC, Cloudy) and otheratomic databases (CHIANTI, ADAS). We show how the updated cooling impacts thestability curve for photoionised plasmas and find a new stable branch.

New radiative loss curve from updates to collisional excitation in the low-density, optically thin plasmas in SPEX