Long-lived (1000s at 300K) excited states of point defects and dislocations were detected in single crystals under the influence of alternating electric fields with an amplitude of 2kV/cm and frequencies ranging from 10Hz to 1kHz. The states were reflected by an increase in the average velocity of dislocations when mechanical stresses were applied after removing the electric field.

J.I.Golovin, A.V.Tyutyunnik: Kristallografiya, 1996, 41[6], 1077-81 (Crystallography Reports, 1996, 41[6], 1024-8)