Literature DB >> 14990492

Torsional vibrational modes of tryptophan studied by terahertz time-domain spectroscopy.

B Yu1, F Zeng, Y Yang, Q Xing, A Chechin, X Xin, I Zeylikovich, R R Alfano.   

Abstract

The low-frequency torsional modes, index of refraction, and absorption of a tryptophan film and pressed powders from 0.2 to 2.0 THz (6.6-66 cm(-1)) were measured by terahertz time-domain spectroscopy at room temperature. It was found that there were two dominated torsional vibrational modes at around 1.435 and 1.842 THz. The associated relaxation lifetimes ( approximately 1 ps) for these modes of the tryptophan molecule were measured. Using a density-functional calculation, the origins of the observed torsional vibrations were assigned to the chain and ring of the tryptophan molecule.

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Year:  2004        PMID： 14990492      PMCID： PMC1304000          DOI： 10.1016/S0006-3495(04)74233-2

Source DB:  PubMed          Journal:  Biophys J        ISSN： 0006-3495            Impact factor:   4.033


  6 in total

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