Phys.org  August 2, 2024 When studying the solar spectrum, researchers often search for emission spectra of two iron ions, Fe IX and Fe X, which are useful for studying the sun’s outer atmosphere. However, both spectra contain emission lines that cannot be matched with known electron transitions, limiting the information which can be gathered from them. A team of researchers in the US (Columbia University, Lawrence Livermore National Laboratory, UC Berkeley) presented measurements made in the wavelength range 238–258 Å which helped them to identify the charge state associated with each of the observed lines. This wavelength range was of […]