The optical absorption of MgF2, MgCl2, and MgBr2 in the vicinity of the Mg L‐shell transitions

The Mg++ LII, III -absorption spectra of evaporated thin films of MgF2, MgCl2, and MgBr, have been measured in the energy range from 50 to 150 eV. Sharp absorption bands due to excitons were found at the onset of transitions from the 2p-shell of Mg++ around 52 eV. At higher energies transitions from the 3d-level of Br- and from the 2s-level of Mg++ show up as absorption maxima. The spectra are compared with those of metallic Mg, and the corresponding alkali halides. The measurements were performed by using the synchrotron radiation of the electron synchrotron DESY.

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