Title :
Low-frequency spectra of amino acids and peptides probed by terahertz time-domain spectroscopy
Author :
Ponseca, Carlito S., Jr. ; Kambara, Ohki ; Kawaguchi, Shintaro ; Tominaga, Kazuhiro
Author_Institution :
Mol. Photoscience Res. Center, Kobe Univ., Kobe, Japan
Abstract :
Low-frequency spectra of amino acids and peptides of L-alanine and glycine were analyzed from the power law behavior of its absorption cross section. For amino acids the exponent around two were observed and interpreted as a collection of harmonic vibrations. However for peptides with longer chain i.e. (Gly)4 and (L-ala)5 exponents were reduced to 1.43 and 1.34, respectively. This behavior shows chain length dependence of the low frequency dynamics.
Keywords :
biological techniques; molecular biophysics; molecular configurations; terahertz spectroscopy; terahertz wave spectra; L-alanine low frequency spectra; absorption cross section power law behavior; amino acid low frequency spectra; glycine low frequency spectra; low frequency dynamics chain length dependence; peptide low frequency spectra; terahertz time domain spectroscopy; Absorption; Amino acids; Crystallization; Equations; Frequency; Helium; Motion analysis; Peptides; Spectroscopy; Time domain analysis;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325724
