晶体中激活离子光谱线热位移的一个机制

光谱线波长随温度变化的现象是近年来经常讨论的一个问题,特别是随着受激发射光谱学的发展,可以在高达1000°K的温度下观测晶体光谱,更给谱线热位移研究提供了有力的实验手段。关于这种热位移目前已有如下机制:1.晶格热膨胀引起晶格场减弱;2.单声子吸

MECHANISM FOR SPECTRAL THERMAL LINE SHIFT OF THE ACTIVE IONS IN CRYSTALS

A mechanism, which has not so far been referred to in the spectral thermal line shift theory of crystal spectroscopy, has been proposed on the basis of the effect of reduction in electron-electron Coulombic interaction as resulting from phonon exchange between innershell electrons. An additional term corresponding to this effect should be introduced to the Hamiltonian of inner-shell electrons. This extra term generates a thermal shift in the centre of energy levels of electron terms. The order of magnitude as well as the temperature dependence of the line shift is in agreement with the experimental data.