Figure 1: ATR-500/Mi?ATR crystal plate (Upper right: Prism and liquid cell) Characterized by wavelengths longer than the mid-infrared region, the far-infrared region is also referred to as the terahertz region. In recent years, this region has been used to evaluate crystal polymorphs for pharmaceuticals and semiconductor device materials, as well as for archaeological research applications, including the study of inorganic pigments. Light in the far-infrared region (terahertz waves) corresponds to hydrogen bonding and Van der Waals forces believed to hold the key to an understanding of the functional JASCO傅立葉變換紅外光譜儀FT/IR-6000 JASCO FTIR-4000傅立葉變換紅外光譜儀 jascoRFT-6000傅立葉變換紅外拉曼光譜儀