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题名: Nonresonant Energy Transfers Independent on the Phonon Densities in Polyatomic Liquids
作者: Chen, Hailong1;  Zhang, Qiang2, 3;  Guo, Xunmin1;  Wen, Xiewen1;  Li, Jiebo1;  Zhuang, Wei2;  Zheng, Junrong1
刊名: JOURNAL OF PHYSICAL CHEMISTRY A
发表日期: 2015-01-29
DOI: 10.1021/jp511651t
卷: 119, 期:4, 页:669-680
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Energy-gap-dependent vibrational-energy transfers among the nitrile stretches of KSCN/(KSCN)-C-13/(KSCN)-C-13-N-15 in D2O, DMF, and formamide liquid solutions at room temperature were measured by the vibrational-energy-exchange method. The energy transfers are slower with a larger energy donor/acceptor gap, independent of the calculated instantaneous normal mode (phonons in liquids) densities or the terahertz absorption spectra. The energy-gap dependences of the nonresonant energy transfers cannot be described by phonon compensation mechanisms with the assumption that phonons are the instantaneous normal modes of the liquids. Instead, the experimental energy-gap dependences can be quantitatively reproduced by the dephasing mechanism. A simple theoretical derivation shows that the fast molecular motions in liquids randomize the modulations on the energy donor and acceptor by phonons and diminish the phonon compensation efficiency on energy transfer. Estimations based on the theoretical derivations suggest that, for most nonresonant intermolecular vibrational-energy transfers in liquids with energy gaps smaller than the thermal energy, the dephasing mechanism dominates the energy-transfer process.
关键词[WOS]: NORMAL-MODE ANALYSIS ;  VIBRATIONAL-RELAXATION ;  MOLECULAR-DYNAMICS ;  AQUEOUS-SOLUTIONS ;  SOLIDS ;  SPECTROSCOPY ;  SYSTEMS
语种: 英语
WOS记录号: WOS:000348752400014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145965
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Rice Univ, Dept Chem, Houston, TX 77005 USA
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Liaoning, Peoples R China
3.Bohai Univ, Inst Chem Chem Engn & Food Safety, Jinzhou 121000, Peoples R China

Recommended Citation:
Chen, Hailong,Zhang, Qiang,Guo, Xunmin,et al. Nonresonant Energy Transfers Independent on the Phonon Densities in Polyatomic Liquids[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2015,119(4):669-680.
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