Answers are grounded in this paper and cite their sources.
The effect of an external electric field on the R absorption lines of LiNbO 3 :Cr 3+ crystals has been studied by a high-sensitivity differential technique at 77 K. Linear Stark effect has been observed in a field directed along the trigonal crystal axis. No effect of the field was observed when directed perpendicular to this axis. These characteristics of the Stark effect provide a convincing argument for the electric dipole moments of Cr 3+ centers being oriented along the trigonal C 3 axis of the crystal and indicate that the chromium centers in LiNbO 3 have C 3 symmetry.
No takes yet. Share an insight, caveat, or question.
Скворцов et al. (1997) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: