Abstract
The shift and broadening of the R lines in gallium-doped ruby are studied as a function of the gallium impurity content (< 2%). A great number of well-resolved emission lines are assigned to gallium-chromium pairs; their first and second excited states are identified by excitation spectroscopy. Weaker lines are assigned to triads formed by one chromium ion and two gallium ions. For most of these triads the shifts of the R lines due to each of the two gallium ions add linearly. A triad formed by two chromium ions (4th NN) and one gallium ion (1st NN to one chromium ion) is also identified and studied. Time-resolved fluorescence line narrowing measurements allow the determination of the energy level scheme of a pair of loosely bound chromium ions.
Published Version
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