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利用一套四极质谱气体分析与测试系统,开展MicroVision Plus四极质谱计的氦(He)、氘(D2)分辨性能实验。分别向分析室送入He和D2,记录质谱图,得到质量刻度和分辨率等信息。He+峰位为(4.0022±0.0006)amu;D2+峰位为(4.0246±0.0006)amu。在10-6～10-4Pa的分压范围,观察到He和D2的分辨率随其分压强的增大而减小。在10-7Pa-m3-s-1的He漏孔条件下,调节D2送气量,He+/D2+分压峰值比在10-1量级可以分辨出He。

Experiments of helium and deuterium resolution performance using a quadrupole mass spectrometer

Base on the gas analysis and testing system of quadrupole mass spectrometer,experiments of resolution performance for helium and deuterium was carried out.The mass spectrograms were recorded when the vacuum vessel was filled with gas.The results show that the peak position for He+ is(4.0022±0.0006)amu and D2+ is(4.0246±0.0006)amu,respectively.Within the pressure range of 10-6～10-4Pa,it is found that the mass resolution of He(and D2) decreases with its partial pressure increase.Under a leak of 10-7Pa-m3-s-1 and adjusting the quantity of deuterium,the helium is discriminated if the peak ratio He+/D2+ is in the order of 10-1.