Abstract

Laser ionization mass spectrometry is one of the most promising methods for analysis of the elemental and isotopic composition of solids in space experiments: the required instruments are highly reliable and easy to operate, no sample preparation is needed, and the spatial resolution of this method is relatively high. In view of this, the LASMA-LR laser ionization mass spectrometer was included into the list of instruments for the future Luna-Glob (Luna-25) and Luna-Resurs-1 (Luna-27) missions, where it will be used to examine the elemental and isotopic composition of lunar regolith at the landing sites. The accuracy of LASMA-LR measurements depends to a considerable extent on the size of the statistical sample of the spectral dataset. This defines the temporal parameters of operation of the mass spectrometer in a space experiment. A series of spectra of enstatite (mineral found in lunar regolith) was measured, and the instrumental accuracy of measurements with spectral datasets of different sizes was estimated. It was demonstrated that an elemental analysis accuracy of 10% is achieved by processing a set of 300 spectra, which corresponds to ~4 h of continuous LASMA-LR operation. A measurement accuracy of 1% for isotopic distributions is achieved within the same 4-hour period only for isotopes with ratios no higher than 10 : 1, while the same accuracy for isotopes with higher ratios requires an unfeasibly long analysis time.

中文翻译：

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在未来的Luna-Glob和Luna-Resurs-1任务中，通过激光飞行时间质谱分析稀土元素的同位素和同位素组成的准确性

摘要

激光电离质谱法是空间实验中分析固体元素和同位素组成的最有前途的方法之一：所需的仪器高度可靠且易于操作，不需要样品制备，并且该方法的空间分辨率为相对较高。有鉴于此，LASMA-LR激光电离质谱仪已被纳入未来Luna-Glob（Luna-25）和Luna-Resurs-1（Luna-27）的仪器清单中。）任务，该任务将用于检查着陆点月球重石的元素和同位素组成。LASMA-LR测量的准确性在很大程度上取决于光谱数据集统计样本的大小。这定义了在空间实验中质谱仪运行的时间参数。测量了一系列的顽辉石的光谱（矿物存在于月球白云岩中），并估计了不同尺寸光谱数据集的测量仪器精度。结果表明，通过处理一组300个光谱可以达到10％的元素分析精度，这相当于连续LASMA-LR操作约4小时。仅在比率不超过10的同位素下，在相同的4小时内同位素分布的测量精度达到1％：