Abstract
A rather simple method is used to simultaneously detect both optical absorption spectra and excited-state nonradiative transitions in 0.03 and 0.16 at. % ruby at temperature 2 K. The technique utilizes a time-resolved bolometer detection of phonons generated by the excited-state nonradiative relaxation following optical excitation with a pulsed tunable dye laser. The observed excitation spectra of phonons coincide well with currently known absorption spectra of both chromium single ions and pairs of the nearest neighbors. For the first time, the fast (≤ µs) resonant energy transfer from single chromium ions to the fourth nearest neighbors is observed directly. New strongly perturbed Cr-single-ion sites are observed.
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