The complex refractive index and the absorption coefficient of polycrystalline L-alanyl-L-alanine have been measured in the frequency range from 5 to 50 cm/sup -1/ by the terahertz time domain spectroscopy. One band at 42 cm/sup -1/ is observed in the absorption spectrum at room temperature. This band is broader than those of polycrystalline L-alanine at room temperature. It suggests that the band width of L-alanyl-L-alanine undergoes larger inhomogeneous broadening than those of L-alanine. The absorption continuum of L-alanyl-L-alanine, which increases with frequency, is found larger than that of L-alanine. The absorption feature can be explained by considering larger unit cell for L-alanyl-L-alanine than that for L-alanine and crystalline disorder.
Spectral features of peptides in the terahertz region
2004-01-01
161937 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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