Utilization of Near- and Vacuum-Ultraviolet Synchrotron Radiation for the Excitation of Visible Fluorescences in Ruby and MgO: ${Cr}^{3 +}$

We report results of studies utilizing ultraviolet synchrotron radiation as a selective excitation source for the

R

-line fluorescence transitions of

{Cr}^{3 +}

in cubic MgO and

{Al}_{2}

O_{3}

. Pump bands for these fluorescences spanning the near and vacuum ultraviolet are identifiable as charge transfer bands of the Cr

O_{6}^{3 -}

complex. We report the observation of broad bands originating from ligand-to-metal bands and terminating in

{(3 d)}^{3}

states. Comparison of the excitation spectra of the broad-band fluorescence with that of the

R

lines allows us to assign certain properties to the charge-transfer bands.

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Utilization of Near- and Vacuum-Ultraviolet Synchrotron Radiation for the Excitation of Visible Fluorescences in Ruby and MgO:Cr3+