The 48th CMS seminar

Seminar & Events Detail

Lecture Title	"2D spectra of two vibrational bands: energy transport and relaxation"
Date	Thursday 10 December 2009 15:00
Lecturer	Dr. Arend Dijkstra
Place	200 Seminar Room, RCCS Building
Summary	Energy transport through vibrational modes in peptides can now be studied in detail using two-dimensional infrared (2DIR) spectroscopy. To understand how experimental data should be interpreted, we have modeled the coupled dynamics in the amide I and II modes in a short alpha helix dissolved in water. From these simulations, time constants for thepartially coherent transport within the amide I band, as well as for the relaxation to the amide II band can be obtained. The connection with observables is made by investigating how these time constants can be extracted from the simulated 2DIR spectra. We find that both the intra- and interband dynamics can be recovered, but only when the collective nature of the vibrations is properly taken into account. This analysis may also be applied to other two-band systems, both in the infrared (collective vibrations) and the visible (excitons) parts of the spectrum.
Contact	Shinji Saito (IMS)

Awards & Honors International collaboration