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The spectrum of thorium as emitted by an electrodeless lamp has been recorded by Connes and collaborators by means of Fourier Transform Spectroscopy in the region 0.9 to 3 μ m. Of the 3100 lines observed, about 1900 are classified as transitions in the energy level system of Th i and 412 in Th ii. Since the average deviation between the observed and calculated wave numbers is less than 0.002 cm -1 , the observed wavelengths are suitable for use as standard wavelengths.

Proposed secondary wavelength standards and line classifications in thorium spectra between 0.9 and 3 m