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Panman, Matthijs R.; van Dijk, Chris N.; Meuzelaar, Heleen; Woutersen, S.

Communication: Nanosecond folding dynamics of an alpha helix: Time-dependent 2D-IR cross peaks observed using polarization-sensitive dispersed pump-probe spectroscopy

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  • Medientyp: E-Artikel
  • Titel: Communication: Nanosecond folding dynamics of an alpha helix: Time-dependent 2D-IR cross peaks observed using polarization-sensitive dispersed pump-probe spectroscopy
  • Beteiligte: Panman, Matthijs R.; van Dijk, Chris N.; Meuzelaar, Heleen; Woutersen, S.
  • Erschienen: AIP Publishing, 2015
  • Erschienen in: The Journal of Chemical Physics
  • Sprache: Englisch
  • DOI: 10.1063/1.4906456
  • ISSN: 0021-9606; 1089-7690
  • Schlagwörter: Physical and Theoretical Chemistry ; General Physics and Astronomy
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:p>We present a simple method to measure the dynamics of cross peaks in time-resolved two-dimensional vibrational spectroscopy. By combining suitably weighted dispersed pump-probe spectra, we eliminate the diagonal contribution to the 2D-IR response, so that the dispersed pump-probe signal contains the projection of only the cross peaks onto one of the axes of the 2D-IR spectrum. We apply the method to investigate the folding dynamics of an alpha-helical peptide in a temperature-jump experiment and find characteristic folding and unfolding time constants of 260 ± 30 and 580 ± 70 ns at 298 K.</jats:p>