Abstract
The questionable existence of C2 absorption lines in spectra of sunspots was checked: In two umbral spectra of large single sunspots evidence for the presence of lines of the (0, 0) band and of the (0, 1) band was found.
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Wöhl, H. On C2 lines in sunspot spectra. Sol Phys 24, 342–353 (1972). https://doi.org/10.1007/BF00153374
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DOI: https://doi.org/10.1007/BF00153374