Temperature and density dependence of line profiles of sodium perturbed by helium

Open Access

Fig. 5

Variation of the absorption cross section of the D2 component with temperature (from top to bottom: T = 3000, 1000, 400, 250, and 150 K, and n_He = 10²⁰ cm⁻³). The corresponding profile for T = 3000 K using pseudo-potentials of Pascale (1983) is overplotted (dashed blue line). The D1 component for T = 3000 K using ab initio potentials of Dell’Angelo et al. (2012) is also overplotted (dashed red line).

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