Development of ultra-wideband THz ATR spectroscopy system and measurement of intermolecular vibrations in phase shift of water

本研究的目的是开发超宽带太赫兹光谱系统，该系统可以产生和检测1到20个太赫兹波。然后，利用该系统观察了水分子伸缩振动模式和振动振动模式对水分子吸收的差异。我们利用DAST和BNA晶体研制了ATR光谱系统，并尝试对水样进行光谱测量。由于水和硅棱镜的吸收很大，目前还不能获得清晰的透射率信号。系统信噪比的修改正在制定中。

The purpose of this research is to develop ultra-wideband THz spectroscopy system which can generate and detect from 1 to 20 THz waves. Then, to observe difference of absorptions caused by stretching and libration vibration modes between water molecules by using the system. We developed ATR spectroscopy system by using DAST and BNA crystals and then tried to spectroscopy measurement for water samples. Because of large absorption due to water and silicon prisme, no clear transmittance signals can be obtained yet. Modification of SN ratio of the system is under development.