Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (4): 209-214 doi: 10.13538/j.1001-8042/nst.23.209-214

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Terahertz spectral properties of melamine and its deuterated isotope,melamine-d_6

HE Mingxia(1,) LI Meng1 TIAN Zhen1 CAO Wei2 HAN Jiaguang1   

  1. 1 Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China 2 School of Electrical and Computer Engineering,Oklahoma State University,Stillwater,Oklahoma 74078,USA
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HE Mingxia, LI Meng, TIAN Zhen, CAO Wei, HAN Jiaguang. Terahertz spectral properties of melamine and its deuterated isotope,melamine-d_6.Nuclear Science and Techniques, 2012, 23(4): 209-214     doi: 10.13538/j.1001-8042/nst.23.209-214

Abstract:

The far-infrared optical properties of melamine and its deuterated isotope,melamine-d_6 were experimentally and theoretically investigated in the frequency range from 0.2 to 3.0 THz.Under the room temperature and dry air nitrogen conditions,three absorption bands were observed at 2.0,2.3 and 2.6 THz in the melamine sample by use of terahertz time-domain spectroscopy.Whereas,in the melamine-d_6 sample,the observed absorption bands shift towards lower frequencies and the relative intensity of the absorption bands reduces.Numerical simulation results based on the Parameterized Model number 3(PM3) were compared with the experimental data and the observed vibration spectra were assigned according to the PM3 calculations.The absorption bands of the measured melamine samples at terahertz frequencies are highly correlated with the intermolecular hydrogen bond stretching and π-π stacking vibration.Also,the red shift of the absorption bands is due to hydrogen/deuterium substitution.

Key words: THz time-domain spectroscopy, melamine, deuterium, hydrogen bond stretching, π-π stacking vibration