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Table 1:

Atomic parameters of the spectral lines.

I ON
$\lambda$ (nm) $\chi_{{\rm low}}$ $\log (gf)$ T RANSITION $\alpha$ $\sigma/a_0^2$ $g_{\rm eff}$
Fe I 630.1501 3.654 -0.75 $\rm 5P_2{-}5D_2$ 0.243 840.5 1.67
Fe I 630.2494 3.686 -1.236 $\rm 5P_1{-}5D_0$ 0.240 856.8 2.5

Notes. $\lambda$ stands for the central wavelength of the transition, $\chi_{{\rm low}}$ is the excitation potential of the lower atomic level in eV, $\log gf$ represents for the multiplicity of the lower level times the oscillator strength, $\alpha$ and $\sigma$ are the collisional broadening parameters in the quantum theory of Anstee et al. (in units of Bohr's radius, a0), and  $g_{\rm eff}$ is the effective Landé factor of the transition.


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