For portable, remotely operated systems in space and defense, relaxed vacuum requirements are a strong advantage of ion trap mass analyzers. However, ion traps are believed to have insufficient capability for isotope ratio measurement because they fundamentally restrict sampling capacity. Focusing on modifications to the detection sequence of a digitally driven 3D quadrupole ion trap, operating in resonance ejection mode, we investigated improved performance for isotope ratio precision and accuracy. Due to xenon's inert nature and wide span of isotopes, xenon isotope ratios provide an excellent marker of processes (e.g. radioactive decay and planetary atmospheric escape) which would be ideally measured by in situ mass spectrometry. To target xenon isotope ratio analysis specifically, we implemented data acquisition system modifications for enhanced y-axis resolution measurements and signal filtering. In this manner, we show measurement precision improvements from ~±100 0/00 to ~±0.1 0/00 and accuracy improvements from ~30 0/00 to ~0.5 0/00 for our targeted isotopes of interest.

中文翻译：

---

在离子阱质谱仪上实现同位素比测量。


对于太空和国防领域的便携式远程操作系统，宽松的真空要求是离子阱质量分析仪的一大优势。然而，离子阱被认为没有足够的同位素比测量能力，因为它们从根本上限制了采样能力。我们重点关注对在共振喷射模式下运行的数字驱动 3D 四极离子阱检测序列的修改，研究了同位素比精度和准确度性能的改进。由于氙的惰性和同位素跨度大，氙同位素比提供了极好的过程标记（例如放射性衰变和行星大气逃逸），理想情况下可以通过原位质谱法进行测量。为了专门针对氙同位素比分析，我们对数据采集系统进行了修改，以增强 y 轴分辨率测量和信号过滤。通过这种方式，我们的目标同位素的测量精度从 ~±100 0/00 提高到 ~±0.1 0/00，准确度从 ~30 0/00 提高到 ~0.5 0/00。