Fig. 1. Schematic of terahertz time-domain spectroscopy system

Fig. 2. Terahertz absorption spectra of L-, D- and DL-arabinose

Fig. 3. Crystal unit cell structure of arabinoses. (a) L-arabinose; (b) D-arabinose; (c) DL-arabinose

Fig. 4. THz-TDS measurements compared with quantum chemical calculations. (a) L-arabinose; (b) D-arabinose; (c) DL-arabinose

Fig. 5. Vibration modes of L-arabinose at different frequencies

Fig. 6. Vibration modes of D-arabinose at different frequencies

Fig. 7. Vibration modes of DL-arabinose at different frequencies