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Figure 1: Value of the wavenumber correction factor keff obtained using laser measurements of seven Th lines [DeGraffenreid & Sansonetti (2002)].
Figure 1

Figure 2: Overview spectrum of a Th-Ar lamp. Wavelength range is 715 nm to 5000 nm (14000 cm-1 to 2000 cm-1). The line intensity is given in arbitrary units. Longwards of 2500 nm (<4000 cm-1) thermal emission from the hot cathode introduces a continuum in the otherwise pure emission lines spectrum.
Figure 2