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电子自旋共振（ＥＳＲ）实验间接表明，γ射线辐照能在室温下在ＢａＦ２微晶中产生Ｆｒｅｎｋｅｌ激子这样的元激发，此元激发受热在１５０℃以下消失。γ射线辐照使ＢａＦ２微晶中Ｆ－离子上的２Ｐ电子跃迁到外层轨道，并与２Ｐ轨道的空穴形成紧束缚的电子－空穴对——Ｆｒｅｎｋｅｌ激子。激子中的电子受热脱离Ｆ原子，这种晶格上的Ｆ０是ＥＳＲ可探测的顺磁色心点缺陷——Ｖｋ心。受γ射线辐照的ＢａＦ２微晶中含有Ｆｒｅｎｋｅｌ激子，受热时Ｆｒｅｎｋｅｌ激子湮灭。Ｖｋ心增多的现象，表现为随温度增高Ｖｋ心的ＥＳＲ信号增强的反常现象。
Electron spin resonance (ESR) experiments indirectly show that γ-ray irradiation can generate a meta-excitation of Frenkel exciton in BaF2 crystallites at room temperature, and the elemental heat disappears below 150 ° C. γ-ray irradiation causes the 2P electrons on the F- ions in the BaF2 crystallites to transition to the outer orbit and form tight tethered electron-hole pairs - Frenkel excitons with the holes in the 2P-orbitals. The electrons in the exciton are heated away from the F atom, and F0 on this lattice is the paramagnetic color point defect of the ESR detectable - the Vk heart. Frenkel excitons are contained in γ-ray-irradiated BaF2 crystallites and annihilated by Frenkel excitons when heated. Vk increased heart phenomenon, manifested as increased temperature Vk heart ESR signal enhancement anomaly.