中文摘要：

本文以中、远红外光谱（4000-100cm^-1）、拉曼光谱（3500～100cm^-1）与密度泛函理论计算相结合的方法，研究了1-乙基-3-甲基咪唑二氰胺盐的稳定结构与振动频率。在实验测定样品红外与拉曼光谱的基础上，对该分子的振动频率进行了详细归属。

英文摘要：

The Raman （3500-100 cm^-1）, mid and far-infrared （4000-100 cm^-1） spectra of 1-ethyl-3-methylimidazolium dicyanamide （[Emim][DCA]） are measured experimental- ly. The structure and theoretical vibrational spectra of [Emim] [DCA] are calculated through the Density Functional Theory （DFT）, and the low energy conformer is obtained and discussed. Combined with the experimental frequencies, detailed assignment of the vi- brational frequencies of [Emim][DCA] are given.