中文摘要：

鞣花酸是一种存在于多种植物中的天然多酚组分，在抑制癌细胞增长和诱导癌细胞凋亡方面有很好的效果，同时也具有抗氧化和抗辐射等作用，在抗癌药品及保健药品中占有重要地位。太赫兹时域光谱技术（THz—TDS）是一种新型的时间分辨相干探测技术，利用太赫兹时域光谱技术研究了鞣花酸在0．2-2．4THz波段的光谱特性，得到了鞣花酸的吸收谱和折射率谱，并利用密度泛函理论（DFT）进行了模拟计算。研究发现，鞣花酸在该波段有光谱响应，分别在0．44THz、0．73THz、0．99THz、1．26THz、1．58THz、1．87THz和2．19THz频率处出现了反常色散现象和吸收峰。

英文摘要：

Ellagic acid is a polyphenol found in many species of plants. It plays an impotent role in inhibiting proliferation and inducing apoptosis of cancer cell. The ellagic acid also has the effect of antioxidation and radioresistance. It was used in a lot of medicine and health products. Terahertz time-domain spectroscopy （THz-TDS） is a new coherent spectral technique. The spectral characteristics of ellagic acid in the range of 0.2-2.4 THz were measured by THz-TDS. The vibration absorption spectrum of the single molecule between 0.2 and 2.4 THz is simulated based on the density functional theory （DFT）. It is found that the ellgic acid has the spectral response to THz radiations in this frequency region, and it shows abnormal dispersion and absorption peaks at 0.44 THz, 0.73 THz, 0.99 THz, 1.26 THz, 1.58 THz, 1.87 THz and 2.19 THz.