One of the most detailed spectrographs ever recorded of the Sun has revealed hundreds of missing wavelengths—gaps in the ...

ABSORPTION spectra of rare-earth ions have been increasingly studied over recent years because of their presentation of band and line absorption in the visible region. Much work has been carried out ...

Scientists have discovered missing colours in the Sun’s light spectrum. Hundreds of dark absorption lines remain unexplained, hinting towards hidden processes in our nearest star’s mysterious ...

Ultrafast extreme ultraviolet (XUV) spectroscopy is a powerful technique for probing the dynamics of atoms and molecules with attosecond time resolution. However, conventional XUV absorption ...