By keeping the dopant level sufficiently low, opacity should not broaden the lines either.
This opacity effect was characterized by the simple ranking of universal markedness constraints.
The theoretical part of this paper gives a brief overview of different models used to calculate the radiative opacity of hot dense plasmas.
The same basic notions can be employed for non-surface-true opacity.
The work is motivated by the need for accurate and systematic procedures for calculating auto-ionizing levels, particularly for laboratory and astrophysical opacity calculations.
This is essentially because of the bound-bound and bound-free contribution to opacities.
In general, rule-based serialism allows opacity nested within opacity in multi-process systems, but sympathy does not.
In the cases they examine, they do not find evidence that the strata required to treat opacity are independently motivated.
