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Vibrational energy transport in peptide helices after excitation of C-D Modes in Leu-d

Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 113, Issue: 40, Page: 13393-13397
2009
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Article Description

Vibrational energy transport in a short 3-helical peptide is studied by time-resolved femtosecond infrared spectroscopy. The C-D vibrations of decadeuterated leucine incorporated in the helical chain are excited, and the subsequent flow of vibrational energy through the helix is monitored by employing C=O probes at various distances from the heat source as local thermometers. The C-D modes are not resonant to the C=O modes, neither directly nor through any Fermi resonance, thereby suppressing resonant energy transfer directly along the C=O oscillators of the peptide backbone. In contrast to our previous work (J. Phys. Chem. B 2008, 772, 9091), we no longer find any substantial difference in the vibrational energy transport efficiency after high-or low-energy excitation. That is, the heat diffusion constant of (2.0 ± 0.5) Å ps is the same as that after depositing vibrational energy through the ultrafast internal conversion of a covalently bound chromophore. © 2009 American Chemical Society.

Bibliographic Details

Schade, Marco; Moretto, Alessandro; Crisma, Marco; Toniolo, Claudio; Hamm, Peter

American Chemical Society (ACS)

Chemistry; Materials Science

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