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利用光声振幅谱和位相谱对稀土配合物(Nd(DBM)3、 Sm(DBM)3和Gd(DBM)3分子内弛豫过程进行了研究。Sm(DBM)3、 Gd(DBM)3和Nd(DBM)3的配体π-π*跃迁的光声振幅强度依次增强，而Gd、 Sm和Nd的配合物在配体吸收波段内位相依次减小，反映分子内的弛豫过程。对于Gd(DBM)3，配体最低三重态能量不能传递到中心离子4f激发态能级上而直接弛豫回基态；对于Sm(DBM)3和Nd(DBM)3，配体三重态能量有效地传递到中心离子上， Nd3+各能级间隔小且相互重叠，激发态能量几乎全部以无辐射跃迁回基态； Sm3+为荧光离子，激发态上的部分能量以荧光形式发射。由此并结合荧光光谱的结果建立了分子内能量弛豫模型。
The intramolecular relaxation processes of rare earth complexes (Nd (DBM) 3, Sm (DBM) 3 and Gd (DBM) 3) were investigated by photoacoustic spectroscopy and phase- The photoacoustic amplitude intensities of the π-π * transitions of Nd (DBM) 3 and the Nd (DBM) 3 transitions increase in turn, while the complexes of Gd, Sm and Nd decrease in the absorption bands of the ligands in turn, reflecting the intramolecular relaxation process. For Gd (DBM) 3, the lowest triplet energy of the ligand can not be transferred to the 4f excited-state energy level of the central ion and directly relax back to the ground state. For Sm (DBM) 3 and Nd (DBM) 3, the ligand triplet energy is effective To the central ion, the Nd3 + energy levels are small and overlap each other, almost all the excited state energy returns to the ground state with no radiation transition; Sm3 + is a fluorescent ion, and part of the energy in the excited state is emitted in the form of fluorescence. The results of the spectroscopy established an intramolecular energy relaxation model.