ESR of Mn²⁺ in RbF and KF

Abstract

In the quenched RbF : Mn²⁺ crystals, spectrum III₄ (g=2.006±0.001, |D|=(108±2)×10⁻⁴ cm⁻¹, A_Mn=−(88±2)×10⁻⁴ cm⁻¹, A_s^F=(11.5±0.4)×10⁻⁴ cm⁻¹, A_p^F=(2.9±0.3)×10⁻⁴ cm⁻¹) is observed at room temperature being overlapped with spectrum III₂ (g=2.005±0.001, |D|=(202±3)×10⁻⁴ cm⁻¹, A_Mn=−(89±2)×10⁻⁴ cm⁻¹, A_s^F=(11.7±0.5)×10⁻⁴ cm⁻¹, A_p^F=(3.0±0.4)×10⁻⁴ cm⁻¹) at 77 K. The symmetry axes of these spectra coincide with the cubic axis of the crystal. Spectrum III₄ is attributed to Mn²⁺-(400) site vacancy pairs ad spectrum III₂ to Mn²⁺-(200) site vacancy pairs. The spectrum with axial symmetry in KF is attributed to Mn²⁺-(400) site vacancy pairs rather than to (200) site ones.