Corpus ID: 118322497

Extended versus localized vibrations: the case of L-cysteine and L-cystine amino acids

@article{Ishikawa2014ExtendedVL,
  title={Extended versus localized vibrations: the case of L-cysteine and L-cystine amino acids},
  author={M. S. Ishikawa and Thamires A. Lima and Fabio Furlan Ferreira and Herculano Martinho},
  journal={arXiv: Soft Condensed Matter},
  year={2014}
}
A detailed quantitative analysis of the specific heat in the $1.8-300$ K temperature range for L-cysteine and L-cystine amino acids was presented. We observed not extended but a sharp transition at $\sim 76$ K for L-cysteine. This transition was associated to the thiol group ordering and the order-disorder transition was adequately modeled by a 2D Ising model. The energy difference among two thiol configurations was found to be $-J=\varepsilon_{A}-\varepsilon_{B}=-66.6$ cal/mole. Besides, we… Expand

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