Three equal-depth thermoluminescence traps in NaCl crystal

Three equal-depth traps reported in NaCl have been attributed to different defect configurations. In this trio system, the basic trap configuration proposed is the bi-vacancy, the analogy being drawn through observations in KCl crystal. Two other defect configurations that emerged are the derivatives of bi-vacancy with the next nearest neighbor I-V pair and the VF center which represents a hole linked to a cation vacancy.