对 SJX-1型四极质谱计管污染后的性能作较详细的实验研究。实验表明,碳氢化合物在电子作用下,在电极表面形成一层绝缘的聚合物膜。由于电荷积累,改变了电场分布,使得四极质谱计灵敏度显著下降、峰形歧变、分辨本领变坏并改变了离子谱的图形系数。本文提出了某些改进意见。 SJX-1-type quadrupole mass spectrometer tubes after the performance of pollution for more detailed experimental study. Experiments show that hydrocarbons form an insulating polymer film on the electrode surface under the action of electrons. Due to the accumulation of electric charge, the electric field distribution is changed, so that the sensitivity of the quadrupole mass spectrometer is significantly decreased, the peak shape is changed, the resolving power is deteriorated, and the pattern factor of the ion spectrum is changed. This article presents some suggestions for improvement.