Theoretical investigations of the vibrational behavior of large molecular systems
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While the dynamics of model systems has been widely studied, the sizes of the systems has been limited. We present the dynamics for two large systems: a 9 degrees of freedom molecule and a 10000 state tier model. Classical non-linear resonance analysis and its quantum analog have been instrumental in providing insight into the pathways and rates of IVR processes in the overtone excitation of small molecules such as benzene and cyanoacetylene. It has been observed that the fourth overtone OH excitation of propargyl alcohol (PPA) is anomalously broad in comparison to the corresponding band of other small alcohols, possibly the result of rapid IVR out of the excited mode. An accurate model displayed no classical relaxation, but the quantum dynamics indicated an approximate degeneracy between the excited OH stretch and a combination band that can explain the observed broadening.
To better understand the tier-to-tier relaxation process, an abstract model consisting of ten tiers of states was developed with the final tier representing the vibrational bath-states via a 50 state/cm
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Marshall, Kenneth Todd. "Theoretical investigations of the vibrational behavior of large molecular systems." (1989) Diss., Rice University. https://hdl.handle.net/1911/16266.