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Revisiting spontaneous Raman scattering for direct oxygen atom quantification

机译:重新探测直接氧原子量化的自发拉曼散射

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In this Letter, the counterintuitive and largely unknown Raman activity of oxygen atoms is evaluated for its capacity to determine absolute densities in gases with significant O-density. The study involves CO2 microwave plasma to generate a self-calibrating mixture and establish accurate cross sections for the P-3(2) <-> P-3(1) and P-3(2) <-> P-3(0) transitions. The approach requires conservation of stoichiometry, confirmed within experimental uncertainty by a 1D fluid model. The measurements yield sigma(J=2 -> 1) = 5.27 +/-(rand:0.17)(sys:0.53) x 10(-31) cm(2)/sr and sigma(J=2 -> 0) = 2.11 +/-(rand:0.06)(sys:0.21) x 10(-31) cm(2)/sr, and the detection limit is estimated to be 1 x 10(15) cm(-3) for systems without other scattering species. (C) 2021 Optical Society of America
机译:在这封信中,我们评估了氧原子的反直觉且基本未知的拉曼活性,以确定具有显著O-密度的气体中的绝对密度。该研究涉及CO2微波等离子体,以生成自校准混合物,并为P-3(2)<->P-3(1)和P-3(2)<->P-3(0)跃迁建立精确的横截面。该方法要求化学计量守恒,在1D流体模型的实验不确定性范围内得到证实。测量结果为sigma(J=2->1)=5.27+/-(rand:0.17)(sys:0.53)x10(-31)cm(2)/sr和sigma(J=2->0)=2.11+/-(rand:0.06)(sys:0.21)x10(-31)cm(2)/sr,对于没有其他散射物种的系统,检测限估计为1 x 10(15)cm(-3)。(2021)美国光学学会

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