Title :
Far-Infrared Vibrational Spectra of L-Ascorbic Acid Investigated by Terahertz Time Domain Spectroscopy
Author :
Cao BingHua ; Zhang Guangxin ; Zhou Zekui
Author_Institution :
Dept. of Control Sci. & Eng., Zhejiang Univ., Hangzhou
Abstract :
The low frequency vibrational modes, index of refraction, and absorption of L-ascorbic acid from 0.2 to 2.4 THz have been studied by terahertz time domain spectroscopy at room temperature. It is found that there are four dominated vibrational modes at 1.80, 2.05, 2.21 and 2.34 THz and the refractive index, varying between 1.77 and 1.83, has a mean value 1.79 in the 0.2-2.4 THz range. In parallel with the experimental study, density functional theory is employed to simulate structure and vibrational frequencies of L-ascorbic acid. Based on the calculated results, the observed vibrational modes in the far infrared region are assigned.
Keywords :
density functional theory; infrared spectra; organic compounds; refractive index; L-ascorbic acid; density functional theory; far-infrared vibrational spectra; refractive index; terahertz time domain spectroscopy; Absorption; Density functional theory; Frequency; Humans; Laser excitation; Optical pulses; Polarization; Probes; Pump lasers; Spectroscopy;
Conference_Titel :
Bioinformatics and Biomedical Engineering, 2008. ICBBE 2008. The 2nd International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-1747-6
Electronic_ISBN :
978-1-4244-1748-3
DOI :
10.1109/ICBBE.2008.18
