Precision evaluation of nitrogen isotope ratios by Raman spectrometry

Precision evaluation of nitrogen isotope ratios by Raman spectrometry
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拉曼光谱法精确评估氮同位素比

DOI:
10.1002/ansa.202200020
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发表时间:
2022
期刊:
Analytical Science Advances
影响因子:
--
通讯作者:
Hagiwara Yuuki
Hagiwara Yuuki
中科院分区:
--
文献类型:
--
作者:
Yamamoto Junji;Hagiwara Yuuki

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我们在室温下测量了在0.1-25 Mpa下获得的N_2流体的拉曼光谱。低压氮气流体的拉曼光谱中的14N15N峰很难检测到,因为存在一组14N15N峰,这些峰归因于14N2的转动振动。在25℃的压力下,在不同的曝光时间下,获得了氮气流体的14N15N和14N2的拉曼峰。每一次检查14N15N和14N2的峰高比和峰面积比的平均值和标准差。对于峰高为100万个14N_2的20个光谱,峰高比和峰面积的标准偏差分别为2.2%和1.9%。这种不确定度大约是从ccd的噪声中预测的两倍。提高像元分辨率可以提高拉曼光谱测量氮同位素比值的精度。
We measured Raman spectra of N2fluids obtained at 0.1–25 MPa at room temperature. The14N15N peak in the Raman spectrum of a low‐pressure N2fluid is difficult to detect because of the prevalence of a group of peaks attributed to rotational vibration of14N2. The Raman peaks of14N15N and14N2of N2fluid at 25 MPa were acquired at various exposure times. The mean values and standard deviations of the peak height ratios and peak area ones of14N15N and14N2were examined for each time. The standard deviations of the peak height ratios and peak area ones were 2.2% and 1.9%, respectively, for 20 spectra acquired with peak height of 1 million counts of14N2. The uncertainties are about two times higher than those predicted from the noise of a CCD. Improvement of the pixel resolution can enhance the precision of the nitrogen isotope ratios by Raman spectroscopy.
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