Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 40, Pages 13393-13397Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp906363a
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Funding
- Swiss National Science Foundation [200021-124463/1]
- Swiss National Science Foundation (SNF) [200021_124463] Funding Source: Swiss National Science Foundation (SNF)
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Vibrational energy transport in a short 3(10)-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, 112, 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) angstrom(2) ps(-1) is the same as that after depositing vibrational energy through the ultrafast internal conversion of a covalently bound chromophore.
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