Abstract The intramolecular vibrational dynamics due to extremely irrational couplings is demonstrated by contrast to the resonance couplings, for the three-mode case of H$_2$O as an example. The extremely irrational couplings are shown to impose such strong hindrance to intramolecular vibrational relaxation (IVR) that they act as barriers. They restrict the direct action/energy transfer between the two stretching modes, though they allow the transfer between a stretching and a bending modes. In contrast, the resonance is more mediated by the bending mode and leads to chaotic IVR. It is also shown that there is a region in the dynamical space in which resonance and extremely irrational couplings coexist.
Received: 04 March 2007
Revised: 15 March 2007
Accepted manuscript online:
PACS:
33.15.Mt
(Rotation, vibration, and vibration-rotation constants)
Fund: Project supported by the National Natural
Science Foundation of China
(Grant No~20373030) and the Foundation for Key Program
of Ministry of Education, China
(Grant No~306020) and the Specialized Research Fund for the Doctoral Program of
Higher Educatio
Cite this article:
Ou Shu-Ching(区树清) and Wu Guo-Zhen(吴国祯) Intramolecular vibrational dynamical barrier due to extremely irrational couplings 2007 Chinese Physics 16 2952
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