第二篇《硼酸盐晶体的晶格振动光谱研究》。
The second part deals with the study of vibrational spectra of borate crystals.
因此，可以从硼酸盐晶体的阴离子基团电负性出发估算其最大二次非线性光学系数，这就为寻找新型的二次非线性光学硼酸盐晶体提供了理论依据。
So, we can estimate the maximal second NLO coefficients of borate crystals from their EN of anion groups, which can be used to search new second NLO borate crystals.
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