Thiophenol‐based molecules are commonly used reporter molecules for various experiments, especially within the scope of surface‐ and tip‐enhanced Raman spectroscopy. Due to their molecular structure, they bind covalently to noble metals and have a huge Raman scattering cross section. Herein, the widely uncharted optical properties of the frequently used probe molecule 4‐nitrothiophenol (p‐NTP or 4‐NTP) are analyzed by resonant Raman spectroscopy. Based on the three different types of samples, it is demonstrated that the molecule exhibits two intrinsic resonances at specific wavelengths. For a wide range of experiments, this is an important information since intrinsic resonances may give rise to an enhancement of the Raman intensity at these specific excitation wavelengths. The Raman cross section of p‐NTP in resonance at 1.9 eV (650 nm) to be 6 × 10⁻²⁶ cm² per molecule is also measured.

中文翻译：

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4-硝基硫代苯酚的共振拉曼散射

基于硫酚的分子是各种实验中常用的报告分子，尤其是在表面和尖端增强拉曼光谱范围内。由于它们的分子结构，它们与贵金属共价结合并具有巨大的拉曼散射截面。在此，通过共振拉曼光谱分析了常用探针分子4-硝基硫酚（p-NTP或4-NTP）广为未知的光学性质。基于三种不同类型的样品，证明该分子在特定波长下表现出两个固有共振。对于广泛的实验，这是重要的信息，因为固有共振可能会导致这些特定激发波长下拉曼强度的增强。共振点处p‐NTP的拉曼截面。还测量了每个分子^-26  cm ²。