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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Single Molecule SERS Spectral Blinking and Vibronic Coupling
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Single Molecule SERS Spectral Blinking and Vibronic Coupling

机译：单分子SERS光谱闪烁和振动耦合

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We examine the time evolution of spectral blinking behavior of single molecule surface-enhanced Raman spectra (SERS). For the molecules examined, it is found that the on—off behavior of the spectral lines is not always in tandem and that the spectral lines can be divided into subsets with separate tandem blinking behavior. One group, despite fluctuating somewhat, is relatively steady in intensity, until they either abruptly or sometimes more gradually disappear. A second group, blinks more sharply, on briefly or off for a longer period. They appear more erratically and often are more intense while on. The former set of lines are found to obtain most of their intensity through Franck— Condon terms in the polarizability expression, while lines for which the Raman intensity is correlated with vibronic coupling tend to blink with sharper on—off differences. We interpret these observations in terms of the theory of vibronic coupling as applied to SERS.
机译：我们研究了单分子表面增强拉曼光谱（SERS）的光谱闪烁行为的时间演化。对于所检查的分子，发现谱线的开关行为并不总是串联的，并且可以将谱线划分为具有单独的串联闪烁行为的子集。一组尽管有一些波动，但强度相对稳定，直到它们突然消失，有时甚至逐渐消失。第二组眨眼更短，闪烁的时间更长或更长时间。它们看起来更不规律，并且经常在运动时变得更强烈。发现前一组线可通过极化率表达式中的Franck-Conden项获得大部分强度，而拉曼强度与振动耦合相关的线则倾向于在开-关差上闪烁。我们根据应用于SERS的振动耦合理论来解释这些观察结果。

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