期刊
ADVANCED OPTICAL MATERIALS
卷 1, 期 6, 页码 449-455出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201200074
关键词
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资金
- National Basic Research Project of China [2009CB930701]
- National Natural Science Foundation of China [90923003, 10874234, 20703064]
- Program of Shenyang Key Laboratory of Optoelectronic materials and technology [F12-254-1-00]
Tip-enhanced resonance couplings (TERCs) are experimentally revealed by high vacuum tip-enhanced Raman spectroscopy (HV-TERS) and theoretically interpreted. The Fermi resonance and Darling-Dennison resonance are successfully observed in HV-TERS, which are the first overtone (or combinational mode)-fundamental interaction (2: 1 resonance coupling) and the first overtone-first overtone resonant interaction (1: 1 resonance coupling), respectively. The electric field gradient plays an important role on TERCs in HV-TERS at the level of the second-order perturbation theory. The molecular tautomeric effects are also observed from thiourea adsorbed on Ag film in HV-TERS. The reported HERCs can provide a deeper understanding of the importance of molecular anharmonicity in high-order perturbation for TERS. HV-TER spectra provide 'additional' nonlinear Raman peaks, compared with the harmonic zero-order perturbation in HV-TERS, and thus enable ultrasensitive chemical analysis at the nanoscale with more vibrational information.
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