晶体中过渡离子的双光子Laser光谱：晶间跃迁
Two-Photon Laser Spectroscopy of Transition Ions in Crystals: Inter- Configurational Transitions
摘要：
对称性适应技术被施加到确定的强度的双光子吸收跃迁，斯塔克水平之间的配置与相反的奇偶性，过渡离子在有限的对称性环境。三阶机制和二阶加一阶机制之间的等价性被清楚地建立。本文导出了具有对称性的两能级间双光子跃迁强度的一个简洁公式。一组（选择）的规则，它控制的强度参数的数量为组态间的过渡。用四角对称的4f组态离子的例子说明了这种形式。
英文摘要：
Symmetry adaptation techniques are applied to the determination of the intensity of two-photon absorption transitions, between Stark levels of configurations with opposite parities, for transition ions in finite symmetry environments. The equivalence between third-order mechanisms and second- plus first-order mechanisms is clearly established. A compact formula is derived for the intensity of a two-photon transition between two levels with well-defined symmetries. A set of (selection) rules which controls the number of intensity parameters for inter-configurational transitions is given. The formalism is illustrated with the case of an ion with 4f configuration in tetragonal symmetry.
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