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当前空间探测活动日益频繁,其中对空间有机分子的探测是空间探测的一项重要任务。由于太空中特殊的工作条件,一般商品质谱仪的体积、功耗和分析能力等都不能满足要求,因此需要研发小体积、低功耗、高稳定性的质谱仪。本研究基于离子阱原理,提出了由多个环形电极构成的新型平方离子阱,这种多环高压结构能有效减小离子阱的体积,从而实现质谱仪器的小型化。通过采用成比例的直流电压分时段供电,成功扩展了该质谱仪的离子检测范围。经仿真计算,拟合出了离子振荡频率与其质量数的关系。该质谱仪对质量数在1~2 000u范围内的分子,质量分辨大于1 400,能够满足空间大分子质量分辨的基本要求。
The current space exploration activities are increasingly frequent, of which the detection of space organic molecules is an important task of space exploration. Due to the special working conditions in space, the mass, power consumption and analytical capabilities of general commercial mass spectrometers can not meet the requirements. Therefore, it is necessary to develop mass spectrometers of small size, low power consumption and high stability. In this study, based on the ion trap principle, a novel square ion trap composed of a plurality of ring electrodes is proposed. This multi-ring high-voltage structure can effectively reduce the volume of the ion trap, thereby miniaturizing the mass spectrometer. The mass spectrometer’s ion detection range was successfully expanded by powering the DC voltage at a fraction of the time. The relationship between the frequency of ion oscillation and its mass is fitted by simulation. The mass spectrometer mass mass in the range of 1 ~ 2 000u molecules, the mass resolution is greater than 1 400, to meet the basic requirements of mass resolution of space macromolecules.