https://www.nist.gov/publications/interferometric-measurement-resonance-transition-wavelengths-civ-siiv-aliii-al-ii-and
Interferometric Measurement of Resonance Transition Wavelengths in CIV, SiIV, AlIII, Al II, and...
Oct 12, 2021 - The wavelength of the important ultraviolet diagnostic lines in the spectra C IV near 155 nm and Si IV near 139 nm were measured with a vacuum ultraviolet Fouri