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报导了Yb :FAP和Yb :C3S2 _FAP晶体在不同温度下的吸收光谱和荧光光谱实验结果 ,研究发现由于电子_声子近共振耦合作用 ,Yb :FAP和Yb :C3S2 _FAP晶体均存在有明显的振动谱 ,Yb :FAP晶体的零声子线在低温下还劈裂为相差 10cm- 1 的两条线 .采用激光选择激发技术研究了Yb3+ 离子在FAP和C3S2 _FAP晶体中的格位特征 ,结果表明Yb3+ 离子在这两种基质中都只占据Ca(Ⅱ )格位 ,但由于CaF2 的挥发 ,导致了Ca(Ⅱ )格位的局部畸变 .
The experimental results of absorption and fluorescence spectra of Yb: FAP and Yb: C3S2 _FAP crystals at different temperatures are reported. It is found that the Yb: FAP and Yb: C3S2 _FAP crystals have obvious Vibration spectrum, the zero-phonon of Yb: FAP crystal was also cleaved into two lines with a difference of 10cm-1 at low temperature.The lattice characteristics of Yb3 + ions in FAP and C3S2_FAP crystals were studied by laser selective excitation technique. The results It is indicated that Yb3 + ions only occupy Ca (Ⅱ) sites in both matrices, but due to the volatilization of CaF2, localized distortions of Ca (Ⅱ) sites were observed.