为发展一种简单工作模式的 GDMS 仪器,本文对中心档片式离子光学系统进行了研究和计算机模拟。这种装置安装在射频辉光放电离子源与四极质谱计之间,对离子进行引出,聚焦,防止光子与电子进入四极分析区,因而有效地抑制了噪声和基线漂移。较佳设计方案的实际使用表明,它可使仪器最小可捡成份达几个 ppm。 In order to develop a simple working mode of GDMS instrument, this paper researches and simulates the center piece ion optical system. This device is installed between the RF glow discharge ion source and the quadrupole mass spectrometer to extract and focus the ions to prevent photons and electrons from entering the quadrupole analysis area, thereby effectively suppressing noise and baseline drift. The actual use of a better design shows that it allows the instrument to pick up parts up to a few ppm.