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The 21Ne/20Ne ratio of atmospheric neon
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-03-19 , DOI: 10.1039/d0ja00031k J. M. Saxton 1, 2, 3
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-03-19 , DOI: 10.1039/d0ja00031k J. M. Saxton 1, 2, 3
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The atmospheric 21Ne/20Ne ratio has been redetermined. The measurement method has several features, which taken in combination, offer a significant advantage over previous determinations. First, a high mass resolving power (MRP > 6000) was used to permit direct assessment of the amount of the 20NeH interference under measurement conditions. Second, measurements were made by mass jumping on a single detector; this removes any assumptions associated with calibration of a multicollector instrument. Third, a Faraday, rather than electron multiplier detector was used, as this avoids non-linearity (dead time) correction. The NeH/Ne ratio was an order of magnitude lower than other recent studies. Interferences other than NeH were assessed but the use of large sample sizes and high MRP ensured that they were resolved or negligible (effect on 21Ne/20Ne < 10−4 relative). Following convention, the 21Ne/20Ne ratios were corrected for mass dependent fractionation to the value corresponding to 22Ne/20Ne = 0.102, which yields a value for atmospheric 21Ne/20NeFC of (2935.6 ± 0.9) × 10−6 (expanded uncertainty, k = 2). The behaviour of 20NeH in the mass spectrometer was also studied. At higher pressures – as used in the isotope ratio measurements – the amount of NeH was approximately constant. For much smaller Ne samples NeH was proportional to Ne, with 20NeH/21Ne = 0.37% for Ne of atmospheric composition.
中文翻译：
大气氖的21Ne / 20Ne比
大气21 Ne / 20 Ne比已重新确定。该测量方法具有多种功能，这些功能相结合，比以前的测定具有明显的优势。首先，使用高质量分辨力（MRP> 6000）可以直接评估20种测量条件下的NeH干扰。其次，通过在单个检测器上进行质量跳跃来进行测量。这消除了与多收集器仪器校准相关的任何假设。第三，使用法拉第而不是电子倍增检测器，因为这样可以避免非线性（停滞时间）校正。NeH / Ne比比其他最近的研究低一个数量级。评估了除NeH以外的其他干扰，但是使用大样本量和高MRP可以确保解决或将其消除（对21 Ne / 20 Ne <10 -4相对值的影响）。按照惯例，将21 Ne / 20 Ne比例校正为质量依赖的分馏值，使其对应于22Ne / 20 Ne = 0.102，得出大气21 Ne / 20 Ne FC的值为（2935.6±0.9）×10 -6（扩展不确定度，k = 2）。还研究了20 NeH在质谱仪中的行为。在较高的压力下（如同位素比测量中所用），NeH的含量大致恒定。对于小得多的Ne样品，NeH与Ne成正比，大气成分的Ne为20 NeH / 21 Ne = 0.37％。
更新日期：2020-03-19
中文翻译：
大气氖的21Ne / 20Ne比
大气21 Ne / 20 Ne比已重新确定。该测量方法具有多种功能，这些功能相结合，比以前的测定具有明显的优势。首先，使用高质量分辨力（MRP> 6000）可以直接评估20种测量条件下的NeH干扰。其次，通过在单个检测器上进行质量跳跃来进行测量。这消除了与多收集器仪器校准相关的任何假设。第三，使用法拉第而不是电子倍增检测器，因为这样可以避免非线性（停滞时间）校正。NeH / Ne比比其他最近的研究低一个数量级。评估了除NeH以外的其他干扰，但是使用大样本量和高MRP可以确保解决或将其消除（对21 Ne / 20 Ne <10 -4相对值的影响）。按照惯例，将21 Ne / 20 Ne比例校正为质量依赖的分馏值，使其对应于22Ne / 20 Ne = 0.102，得出大气21 Ne / 20 Ne FC的值为（2935.6±0.9）×10 -6（扩展不确定度，k = 2）。还研究了20 NeH在质谱仪中的行为。在较高的压力下（如同位素比测量中所用），NeH的含量大致恒定。对于小得多的Ne样品，NeH与Ne成正比，大气成分的Ne为20 NeH / 21 Ne = 0.37％。
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