Caption: The spectrum for the visible band (fiducial range 0.4--0.7 μm) of neutral atomic sodium (Na, Z=11) (AKA Na I). The image looks like an actual observation, but it may be very good computer simulation.
Many atomic spectral lines are shown, but in dim, low-dispersion spectra perhaps only 8 lines (which are all multiple unresolved lines) may be observed. These lines will be in the ranges:
A Grotrian diagram for Na I with atomic spectral line wavelengths labed in nanometers (nm) is at Na I: grotrian diagram.
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