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本文简单介绍了线振质谱计的工作原理,着重介绍该仪器的关键部件——离子谐振质谱管的离子光学系统的设计与计算。按照理论分析,产生离子谐振的条件为:系统的沿轴电位分布曲线满足抛物线方程。对于给定边界条件的系统,应用超松弛迭代法计算系统内各点的电位值,然后用最小二乘法拟合与之接近的抛物线方程,从理想系统与实际系统的差异决定该系统性能的优劣。通过大量计算,提出较佳的结构尺寸和电位布置,作为试制样管、设计线路和调试仪器的基本数据。本文的计算工作是在TRS—80机上进行的。
This article briefly introduces the working principle of the line vibration mass spectrometer and focuses on the design and calculation of the ion optical system of the ion resonance mass spectrometer, the key component of the instrument. According to theoretical analysis, the conditions for generating ion resonance are: the system along the axis potential distribution curve to meet the parabolic equation. For the system with given boundary conditions, the over-relaxation iterative method is used to calculate the potential of each point in the system, and then the least square method is used to fit the parabolic equation close to it. The difference between the ideal system and the actual system determines the performance of the system inferior. Through a large number of calculations, put forward a better structure size and potential layout, as a pilot sample tube, circuit design and commissioning of the basic equipment data. The calculation of this paper is carried out on the TRS-80.