【摘要】 采用扩散法在KCl:Li:Na晶体中形成了浓度适当、分布均匀的F心.以汞灯进行色心转型,获得了F_A(II)心和F_B(II)心.测量77K时晶体的吸收谱,观察到明显的双峰结构.在相同的温度下测得晶体的荧光谱.F_b(II)心和F_A(II)心的荧光峰分别为2.49μm和2.66μm.采用点离子模型并在离子尺度修正中计入次近邻离子的贡献,计算了KCl晶体F_A(Li)心的非微扰态,然后以微扰法计算了F_A(Li)心的能级位置.计算值与实验值比较,结果令人满意.更多还原

【Abstract】 Moderate conentration and well-distributed F centers were created in Li-Na doped KCl crystals through diffusion. Hg lamp was used for the centers conversion and FA (II)-FB (II) centers were obtained. Absorption spectrum of the crystal was measured at 77 K, in which double-peaks structure was displayed obviously. Luminous spectrum of FB(II)-FA(II) centers was measured at the same temperature. The luminous peaks of FB(II)-FA(II) centers are at 2.49 μm and 2.66μm respectively. Using the point ion model and taking into consideration the contribution of the second-nearest ions in the ion size correction, the unperturbed state of FA(Li) center in KCl crystal was obtained. Then energy level of FA center was calculated using perturbation method. The result is satisfactory compared with the experiment data.更多还原