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在Ｒ－Ｇ理论的基础上，考虑了无辐射弛豫过程对位相信号的影响，推导出新的位相公式．研究结果表明，位相（ψ）与吸收系数（β）、热扩散长（μ）、弛豫时的延迟时间（τ）和快弛豫与慢弛豫时的热量比（Ｒ）有关．并用此公式解释了稀土化合物ＰｒＦ３和叶绿素ｂ的位相谱．ＰｒＦ３的位相由ｆ－ｆ跃迁的吸收系数决定，而叶绿素ｂ两个吸收带之间的位相差是由快弛豫与慢弛豫时放出的热量比不同产生的．
On the basis of R-G theory, the influence of non-radiation relaxation process on the phase signal is considered and a new phase formula is deduced. The results show that the phase (ψ) is related to the absorption coefficient (β), the thermal diffusion length (μ), the delay time (τ) at relaxation and the heat ratio (R) at fast relaxation to slow relaxation. And using this formula to explain the phase spectrum of rare earth compounds PrF3 and chlorophyll b. The phase of PrF3 is determined by the absorption coefficient of the f-f transition, and the phase difference between the two absorption bands of chlorophyll b is due to the difference in the amount of heat released during fast relaxation and slow relaxation.