Title Anharmonic coupling between fundamental modes intetramethylurea

semanticscholar(2017)

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摘要
print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. Articles you may be interested in Vibrational and structural properties of tetramethyltin under pressure Mode-selective vibrational redistribution after spectrally selective N–H stretching mode excitation in intermolecular hydrogen bonds Ab initio study of vibrational anharmonic coupling effects in oligo(para-phenylenes) High-pressure structures of methane hydrate observed up to 8 GPa at room temperature Experimental and theoretical anharmonicity for benzene using density functional theory In situ high pressure Raman spectra of tetramethylurea have been measured up to 25 GPa, liquid-solid and solid-solid phase transitions were detected at 0.2 GPa and 7.4 GPa, respectively. An unprecedented spectral phenomenon is the observation of a Fermi resonance between the fundamental modes. An exponential relationship between the intensity and the frequency difference was concluded. Pressure provides us a new way to study the correlation between Fermi resonance parameters.
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