Two-dimensional spectroscopy of extended molecular systems: applications to energy transport and relaxation in an alpha-helix.
A simulation study of the coupled dynamics of amide I and amide II vibrations in an alpha-helix dissolved in water shows that two-dimensional (2D) infrared spectroscopy may be used to disentangle the energy transport along the helix through each of these modes from the energy relaxation between them. Time scales for both types of processes are obtained. Using polarization-dependent 2D spectroscopy is an important ingredient in the method we propose. The method may also be applied to other two-band systems, both in the infrared (collective vibrations) and the visible (excitons) parts of the spectrum.
Center for Theoretical Physics and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Arend G
AG
Dijkstra
Thomas L C
TL
Jansen
Jasper
J
Knoester