{"title":"Energy transfer and non-equipartition in nonlinearly coupled oscillators with Fermi resonance","authors":"Shigenori Tanaka, Yoshio Okiyama","doi":"10.1016/j.cplett.2025.141889","DOIUrl":null,"url":null,"abstract":"<div><div>Vibrational energy transfer in a nonlinearly coupled oscillator system with the Fermi resonance is studied employing a simple model. When excitation energies are given to some specific vibrational modes, they are redistributed over other modes, but the equipartition of thermal energy is not fully realized along with the violation of ergodicity. With the aid of a coarse-grained theory to accurately describe the dynamics of slowly varying mode amplitudes, we investigate the reason for the non-equipartition and find a crucial role played by the energy conservation, which takes precedence over the maximum entropy principle toward the equipartition of energy.</div></div>","PeriodicalId":273,"journal":{"name":"Chemical Physics Letters","volume":"864 ","pages":"Article 141889"},"PeriodicalIF":2.8000,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Physics Letters","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0009261425000296","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Vibrational energy transfer in a nonlinearly coupled oscillator system with the Fermi resonance is studied employing a simple model. When excitation energies are given to some specific vibrational modes, they are redistributed over other modes, but the equipartition of thermal energy is not fully realized along with the violation of ergodicity. With the aid of a coarse-grained theory to accurately describe the dynamics of slowly varying mode amplitudes, we investigate the reason for the non-equipartition and find a crucial role played by the energy conservation, which takes precedence over the maximum entropy principle toward the equipartition of energy.
期刊介绍：
Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage.
Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.
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