More than 130 line peaks in electron spin resonance (ESR) spectra were discovered from the shoulder part of the as-grown MgF2 and MgF2:Co crystal at room-temperature experiments.

• 在室温条件下的电子自旋共振(ESR)波谱实验中发现两个分别取自MgF2单晶生长的放肩部位和MgF2:Co晶体样品有130多条相同的各向异性谱ESR峰。