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The Puzzle of the La I Lines 6520 644 Å and 6519 869 Å

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Figure

Figure 1. Part of the FT spectrum. The left line, 6520.644 Å (SNR 240), is an unclassified line, well known but given as 6520.770 Å in spectral tables [1]
Figure 2. Setup for laser spectroscopic investigations. BS beam splitter, M mirror, L lens, f chopper wheel with frequency f, PMT photomultiplier (Hamamatsu R955), LIF laser-induced fluorescence, OG optogalvanic signal
Figure 3. Optogalvanic scan of the line 6520.644 Å. On the left side, there is a blending transition (explanation see part “Check of wavelength accuracy of literature values”)
Figure 4. a) Schematic level scheme. e transition excited by laser light. f direct fluorescence line
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