Surface- and resonance-enhanced micro-Raman spectroscopy of xanthene dyes: from the ensemble to single molecules.
Surface- and resonance-enhanced micro-Raman spectroscopy of xanthene dyes: from the ensemble to single molecules.
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DOI：
10.1002/cphc.200400395
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发表时间：
2005-01
期刊：
影响因子：
--
通讯作者：
T. Vosgröne;A. Meixner
中科院分区：
文献类型：
--
作者：
T. Vosgröne;A. Meixner
利用配备光谱仪和ccd探测器的高分辨率共聚焦激光显微镜，记录了不同罗丹明染料、吡啶G和硫代吡啶吸附在分离银团簇上的表面增强共振拉曼散射（SERRS）光谱。将单分子光谱与系综光谱进行比较，揭示了不同亚稳谱态之间的谱线分裂、谱徘徊、谱扩散和谱突变等非均匀谱特征，揭示了谱带的位置和相对强度。共振增强是研究相对于单分子表面增强拉曼散射（SERS）光谱，并发现负责大约三个数量级的灵敏度。取代基对单分子SERRS敏感性有显著影响，表明除了电磁增强效应外，还有多种化学效应对表面增强起作用。
Surface-enhanced resonance Raman scattering (SERRS) spectra of various rhodamine dyes, of pyronine G and thiopyronine adsorbed on isolated silver clusters were recorded at the ensemble level and at the single-molecule level with a high-resolution confocal laser microscope equipped with a spectrograph and a CCD-detector. Comparing single-molecule spectra with ensemble spectra, various inhomogeneous spectral features, such as line splitting, spectral wandering, spectral diffusion and abrupt spectral jumps between different metastable spectral states, are revealed positions and the relative intensities of the vibronic bands. Resonance enhancement is investigated with respect to single-molecule surface-enhanced Raman scattering (SERS) spectroscopy and is found to be responsible for approximately three orders of magnitude in sensitivity. A significant influence of the substituents on the single-molecule SERRS sensitivity is found, showing that various chemical effects are responsible for surface enhancement in addition to the electromagnetic enhancement effect.