Terahertz spectrum of gallic acid

Meng Wu; Guozhong Zhao; Haiyan Wang

doi:10.1117/12.837432

18 November 2009 Terahertz spectrum of gallic acid

Meng Wu, Guozhong Zhao, Haiyan Wang

Proceedings Volume 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security; 75120E (2009) https://doi.org/10.1117/12.837432
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

Gallic acid is natural polyphenol compound found in many green plants. More and more experiments have demonstrated that the gallic acid has comprehensive applications. In the field of medicine, the gallic acid plays an important role in antianaphylaxis, antineoplastic, antimycotic, anti-inflammatory, antivirotic, antiasthmatic and inhibiting the degradation of insulin. It also has a lot of applications in chemical industry, food industry and light industry. So it is important to study the terahertz time-domain spectroscopy of gallic acid. Terahertz time-domain spectroscopy (THz-TDS) is a new coherent spectral technology based on the femtosecond laser. In this work, the spectral characteristics of gallic acid in the range of 0.4 THz to 2.6 THz have been measured by THz-TDS. We obtained its absorption and refraction spectra at room temperature. The vibration absorption spectrum of the single molecule between 0.4 THz and 2.6 THz is simulated based on the Density Functional Theory (DFT). It is found that the gallic acid has the spectral response to THz wave in this frequency range. The results show the abnormal dispersion at 1.51 THz and 2.05 THz. These results can be used in the qualitative analysis of gallic acid and the medicine and food inspection.

Citation Download Citation

Meng Wu, Guozhong Zhao, and Haiyan Wang "Terahertz spectrum of gallic acid", Proc. SPIE 7512, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Information Security, 75120E (18 November 2009); https://doi.org/10.1117/12.837432

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