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本文通过分析不同几何配置下的偏振拉曼光谱对非线性光学晶体的晶格振动模式进行了研究.首先根据因子群分析,将晶体的振动模按晶体对称群的不可约表示进行分类,其次测量了晶体在10—1600 cm 1范围内,不同几何配置下的偏振拉曼光谱,并在此基础上指认了晶体的晶格振动模式.300 cm 1以下的振动峰,归结为晶体的外振动,来自[BiO6],[ZnO4],[BO4]和[BO3]原子基团的平动和转动;300cm 1以上为晶体的内振动,主要与Bi-O,和Zn-O键振动有关.晶体拉曼光谱中最高振动频率达到1407 cm 1,被指认为[BO3]三角形中B-O键的伸缩振动,体现了[BO3]基团中高的电子非局域化程度.
In this paper, the lattice vibration modes of nonlinear optical crystals are studied by analyzing the polarization Raman spectra under different geometrical configurations.Firstly, according to the factor analysis, the vibration modes of the crystals are classified according to the irreducible representation of the crystal symmetry groups, and secondly, The Raman spectra of the crystals in the range of 10-1600 cm -1 and in different geometric configurations were obtained and the lattice vibration modes of the crystals were identified. The vibrational peaks below 300 cm 1 were attributed to the external vibration of the crystals, From [BiO6], [ZnO4], [BO4] and [BO3] atomic group translation and rotation; 300cm1 above the internal vibration of the crystal, mainly with the Bi-O, and Zn- The maximum vibrational frequency in the Man spectrum reaches 1407 cm 1, which is considered as the stretching vibration of the BO bond in the [BO3] triangle, indicating the high degree of electron nonlocalization in the [BO3] group.