Figure 2 from The Spectrum of Thorium from 250 nm to 5500 nm: Ritz Wavelengths and Optimized Energy Levels

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The Spectrum of Thorium from 250 nm to 5500 nm: Ritz Wavelengths and Optimized Energy Levels

Authors: Stephen L. Redman, Gillian Nave, and Craig J. Sansonetti

Redman, Nave, & Sansonetti 2014 The Astrophysical Journal Supplement Series 211 4.

Provider: AAS Journals

Caption: Figure 2.

Wavenumber correction factor κ determined for the Th/Ar spectrum obtained at NIST. We compared three different standards to our measured wavenumbers: neutral argon lines, low-energy Ar-II lines, and 30 thorium lines that have been measured to precisions of a few parts in 10 ⁸ by LS3.

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