A(N)⁄⁄=59.4, and A(N)⊥=32.8 for the second center. When the crystals X-irradiated at 77 K were exposed to visible light, the two centers disappeared simultaneously and the NO2 radicals increased. When the crystals X-irradiated at 77 K were warmed to room temperature, the first center changed to a new paramagnetic center, in which the unpaired electron coupled with a silver nucleus, two equivalent nitrogen
硝酸银(I)-
丁二腈(1/1)单晶的 ESR 光谱在 77 K 下测量。两个顺磁中心,–CN…Ag2+…NC– 和 NO32−…Ag+,同时出现在77 K 下的 X 辐照。 g 值 (g) 和超精细耦合常数(A 以 10−1 cm−4 为单位)的主要值为 g1=2.050、g2=2.053 和 g3=2.302,A (Ag)1=21.8, A(Ag)2=22.0, A(Ag)3=34.9, A(N)1=15.3, A(N)2=15.9, A(N)3=14.0 第一个中心,g⁄⁄=2.001、g⊥=2.006、A(Ag)⁄⁄=20.3、A(Ag)⊥=17.4、A(N)⁄⁄=59.4、A(N)⊥=32.8第二个中心。当在 77 K 下 X 射线照射的晶体暴露在可见光下时,两个中心同时消失,
NO2 自由基增加。当在 77 K 下 X 射线照射的晶体加热到室温时,第一个中心变为新的顺磁中心,