Effect of uniaxial stress on NaF:Cu+ electronic transitions

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Abstract
We have performed uniaxial stress measurements on the 1Eg,1T2g, and 3Eg excited states of NaF:Cu+. Stress was applied along the [001] axis producing a tetragonal and a hydrostatic strain. From the tetragonal splitting, we have determined the Jahn–Teller energy in the 1Eg state to be 320 cm−1 thus supporting the recent reassignment of the states of Eg symmetry in this system [J. M. Berg and D. S. McClure, J. Chem. Phys. 9 0, 3915 (1989)].