[8p-A405-1~13] 3.9 Terahertz technologies

[8p-A405-2] High sensitive detection of contaminants in organic crystal by high accuracy terahertz absorption spectroscopy

〇Tetsuo Sasaki¹, Tomoaki Sakamoto², Makoto Otsuka³ (1.Shizuoka Univ., 2.NIHS, 3.Musashino Univ.)

Keywords:contaminants detection, organic crystals, terahertz spectroscopy

Defects in organic crystals can be detected as absorption frequency shifts in THz spectra.High accuracy continuous wave GaP terahertz spectrometer (frequency range 0.6 - 6.0 THz, best resolution 8 MHz) was applied to the sample including a small amount of contaminants at low temperature. The detection limit of contaminants in asparagine crystal was estimated to be 100 ppm. Different sensitivities of absorption line frequency shifts by a contaminant molecule suggest identifiability of molecules by the measurement.