光合微生物散射光的圆偏振检测
Detection of circular polarization in light scattered from photosynthetic microbes
摘要：
确定一种可以遥感的通用生物特征，对于在宇宙其他地方成功寻找生命的前景至关重要。一个候选的通用生物特征是同手性，这可能是所有生物化学生命的通用属性。由于手性分子的光学活性，人们假设，这种独特的特性可以提供一个合适的遥感探头使用圆偏振光谱。在这里，我们报告的检测光散射光合微生物的圆偏振。我们表明，圆偏振似乎产生的光合吸收带的强电子跃迁的圆二色性。我们的结论是，圆偏振光谱可以提供一个强大的遥感技术，为一般的生命搜索。
英文摘要：
The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the universe. A candidate universal biosignature is homochirality, which is likely to be a generic property of all biochemical life. Due to the optical activity of chiral molecules, it has been hypothesized that this unique characteristic may provide a suitable remote sensing probe using circular polarization spectroscopy. Here, we report the detection of circular polarization in light scattered by photosynthetic microbes. We show that the circular polarization appears to arise from circular dichroism of the strong electronic transitions of photosynthetic absorption bands. We conclude that circular polarization spectroscopy could provide a powerful remote sensing technique for generic life searches.
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