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Terahertz absorption spectra of L-, D-, and DL-alanine and their application to determination of enantiometric composition

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5 Author(s)
Yamaguchi, Mariko ; Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan ; Miyamaru, F. ; Yamamoto, K. ; Tani, M.
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Absorption spectra of polycrystalline L-, D-, and DL-alanine have been measured by the terahertz time domain spectroscopy (THz-TDS) in the frequency range from 10 to 90 cm-1 at room temperature. We observed several absorption bands, which have the large difference between enantiomers (L- and D-alanine) and the racemic compound (DL-alanine) in their peak frequencies. This obvious difference shows that the THz absorption bands are strikingly sensitive to the crystal structures. This result indicates that the THz-TDS can be used for distinguishing between the enantiomers and the racemic compound. We propose and demonstrate a method to determine the enantiometric composition of amino acids from the THz absorption spectra.

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Applied Physics Letters  (Volume:86 ,  Issue: 5 )