固态多环芳烃化合物的THz时域光谱研究

THz Time-Domain Spectroscopy of Polyring Aromatic Compounds in Solid Phase

利用太赫兹时域光谱技术室温下对芳烃化合物萘、联苯、蒽、α 萘酚和 β 萘酚在 3～ 73cm-1(0 1～ 2 2THz)频谱范围内进行了光谱测量。结果表明 ,多环芳烃化合物在此波段有不同的吸收特征。不能形成氢键的萘、联苯和蒽在 67cm-1(2 0THz)附近均有一吸收峰 ,这可能是由于分子之间的振动即晶格振动所引起的 ;而能够形成氢键的α 萘酚和β 萘酚 ,其吸收峰可归结于分子间氢键的相互作用所引起的集体振动模式。THz时域光谱不仅能够鉴别分子结构存在微小差别的化合物而且还能鉴别同分异构体。

The absorption spectra of aromatic compounds naphthalene、biphenyl、anthracene、α-naphthol and β-naphthol has been measured by terahertz time-domai n spectroscopy over the frequency range from 0.1 to 2.2THz at room temperature. It was found that different polyring aromatic compounds show distinct characteristic spectra in the THz region. In the crystals without hydrogen bonds the absorption may be assigned to intermolecular lattice vibrational modes. In the crystals with h ydrogen bonds, there appears more absorption peaks between 1.1THz and 1.6THz. They can be attributed to collective vibrational modes of hydrogen bonds networks. Terahertz time-domain spectroscopy can be used to identify not only the compound s with similar chemical constituents but also isomeric compounds.