Title :
Terahertz spectrum of ellagic acid
Author :
Wu, Meng ; Zhao, Guozhong ; Zhang, Cunlin
Author_Institution :
Dept. of Phys., Capital Normal Univ., Beijing, China
Abstract :
The absorption and refractive index of ellagic acid in the range of 0.2-2.4 THz have been measured by THz-TDS. It is found that the ellagic acid has the fingerprint absorption in this frequency region. The vibration absorption spectrum of the single molecule of ellagic acid between 0.2 and 2.4 THz is simulated based on the Density Functional Theory (DFT). THz absorption at low frequencies is attributed to the vibration absorption of water of crystallization. The results presented in this paper will be helpful for the inspection of medicine and food.
Keywords :
molecular biophysics; organic compounds; terahertz spectroscopy; terahertz wave spectra; vibrational states; density functional theory; ellagic acid terahertz absorption spectrum; ellagic acid terahertz refractive index; frequency 0.2 GHz to 2.4 GHz; terahertz time domain spectroscopy; vibration absorption spectrum; water of crystallization vibration absorption; Absorption; Biomedical optical imaging; Chemical technology; Frequency; Optical refraction; Optical surface waves; Refractive index; Submillimeter wave technology; Surface emitting lasers; Ultrafast optics;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5324678
