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Vibrational Energy Transport in Peptide Helices after Excitation of CāD Modes in Leu-d10
- Source :
- The journal of physical chemistry. B 113 (2009): 13393ā13397. doi:10.1021/jp906363a, info:cnr-pdr/source/autori:Marco Schade; Alessandro Moretto; Marco Crisma; Claudio Toniolo; Peter Hamm/titolo:Vibrational energy transport in peptide helices after excitation of C-D modes in Leu-d10/doi:10.1021%2Fjp906363a/rivista:The journal of physical chemistry. B/anno:2009/pagina_da:13393/pagina_a:13397/intervallo_pagine:13393ā13397/volume:113
- Publication Year :
- 2009
- Publisher :
- American Chemical Society (ACS), 2009.
-
Abstract
- 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 horizontal lineO probes at various distances from the heat source as local thermometers. The C-D modes are not resonant to the C horizontal lineO modes, neither directly nor through any Fermi resonance, thereby suppressing resonant energy transfer directly along the C horizontal lineO 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) A(2) ps(-1) is the same as that after depositing vibrational energy through the ultrafast internal conversion of a covalently bound chromophore.
- Subjects :
- Resonant inductive coupling
Infrared spectroscopy
EXCITED-STATE
Vibration
Protein Structure, Secondary
CARBONMONOXY MYOGLOBIN
Leucine
ALPHA-AMINOISOBUTYRIC-ACID
Spectroscopy, Fourier Transform Infrared
Physics::Atomic and Molecular Clusters
Materials Chemistry
Physics::Chemical Physics
Physical and Theoretical Chemistry
Quantitative Biology::Biomolecules
Molecular Structure
Chemistry
Chromophore
Internal conversion (chemistry)
Surfaces, Coatings and Films
Energy Transfer
MOLECULAR-DYNAMICS
Excited state
Helix
Solvents
Fermi resonance
Atomic physics
Peptides
Excitation
Subjects
Details
- ISSN :
- 15205207 and 15206106
- Volume :
- 113
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry B
- Accession number :
- edsair.doi.dedup.....90c34b99502200aeba4e09c28514472c