Relaxation channels of two-vibron bound states in α-helix proteins

Details Relaxation channels of two-vibron bound states in α-helix proteins Relaxation channels of two-vibron bound states in α-helix proteins

2003-10-15

arxiv.org/abs/physics/0310070v1

Physics

Biological Physics

octobre 2003 - soumis Phys. Rev. E

Scientific paper

10.1103/PhysRevE.69.041906

Relaxation channels for two-vibron bound states in an anharmonic alpha-helix protein are studied. It is pointed out that the relaxation originates in the interaction between the dressed anharmonic vibrons and the remaining phonons. This interaction is responsible for the occurrence of transitions between two-vibron eigenstates mediated by both phonon absorption and phonon emission. At biological temperature, it is shown that the relaxation rate does not significantly depends on the nature of the two-vibron state involved in the process. Therefore, the lifetime for both bound and free states is of the same order of magnitude and ranges between 0.1 and 1.0 ps for realistic parameters. By contrast, the relaxation channels strongly depend on the nature of the two-vibron states which is a consequence of the breather-like behavior of the two-vibron bound states.

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