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Accurate measurements of the Raman scattering coefficient and the depolarization ratio in liquid water

机译：准确测量液态水中拉曼散射系数和去极化比

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摘要

Despite a long history, the Raman scattering coefficient of water has so far only been measured with 10% uncertainty using a 95% confidence interval. In this paper, we present an experiment where we have achieved 1.5% uncertainty by using a low concentration of Rhodamine 6G in ethanol as a reference along with accurate consideration of polarization-related effects and the geometry of the experimental setup. We have found that the photon-to-photon Raman scattering coefficient of the OH stretching band of liquid water is (1.84 ± 0.03) × 10~(-4) m~(-1) when integrated over the spectral frequency range from 620 to 700 nm while the exciting laser operates at 532 nm. We have also accurately measured the depolarization ratio across this band.
机译：尽管历史悠久，但迄今为止，水的拉曼散射系数只有在使用95％置信区间的10％不确定性下才能测量。在本文中，我们提出了一个实验，通过使用乙醇中低浓度的若丹明6G作为参考，并精确考虑了极化相关的影响和实验装置的几何形状，我们实现了1.5％的不确定性。我们发现，当在620至200的频谱频率范围内积分时，液态水的OH拉伸带的光子对光子拉曼散射系数为（1.84±0.03）×10〜（-4）m〜（-1）。 700 nm，而激发激光器在532 nm下工作。我们还精确测量了该频段的去极化率。

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